| 单词 | quasar |
| 例句 | The distance from the Earth to the most remote quasars is eight or ten billion light- years. Cosmos 1980-01-01T00:00:00Z There were clusters of freckles on her forearms and wrists, an entire Milky Way spreading across her forehead, even a few sputtering quasars flung into the wormholes of her ears. Middlesex: A Novel 2002-06-05T00:00:00Z But more recent observations by Ricardo Giacconi may have resolved the X-ray glow into individual points, perhaps an immense horde of distant quasars. Cosmos 1980-01-01T00:00:00Z Dad explained light-years and black holes and quasars and told us about the special qualities of Betelgeuse, Rigel, and Venus. The Glass Castle 2005-03-01T00:00:00Z The nearest quasar is perhaps half a billion light-years away. Cosmos 1980-01-01T00:00:00Z The astronomer Halton Arp has found enigmatic and disturbing cases where a galaxy and a quasar, or a pair of galaxies, that are in apparent physical association have very different red shifts. Cosmos 1980-01-01T00:00:00Z He believes the quasars are not at cosmological distances but instead are being ejected, left and right, by the “foreground” galaxy; and that the red shifts are the result of some as-yet-unfathomed mechanism. Cosmos 1980-01-01T00:00:00Z Arp points to other cases in which a galaxy with a small red shift is flanked by two quasars of large and almost identical red shift. Cosmos 1980-01-01T00:00:00Z Billions of light- years away are still more tumultuous objects, the quasars, which may be the colossal explosions of young galaxies, the mightiest events in the history of the universe since the Big Bang itself. Cosmos 1980-01-01T00:00:00Z If Arp is right, the exotic mechanisms proposed to explain the energy source of distant quasars—supernova chain reactions, supermassive black holes and the like—would prove unnecessary. Cosmos 1980-01-01T00:00:00Z Perhaps a quasar standard candle will be found, and the distances to the quasars determined independent of their red shifts. Cosmos 1980-01-01T00:00:00Z The word “quasar” is an acronym for “quasi-stellar radio source.” Cosmos 1980-01-01T00:00:00Z On the other hand, when we look at a quasar eight billion light-years away, the fact that we are seeing it as it was eight billion years ago may be very important. Cosmos 1980-01-01T00:00:00Z In detecting the cosmic background radiation, in counting quasars, in searching for intelligent signals from space, radio astronomers are dealing with amounts of energy that are barely there at all. Cosmos 1980-01-01T00:00:00Z In every quasar explosion millions of worlds—some with life and the intelligence to understand what is happening—may be utterly destroyed. Cosmos 1980-01-01T00:00:00Z Her face was hard to see except for the pinpoints of her eyes, which shone like quasars. The House of Hades 2013-10-08T00:00:00Z They pay almost no attention to all the moons and planets, asteroids and comets, quasars and pulsars, exploding galaxies, symbiotic stars, cataclysmic variables and X-ray sources that have been discovered since Ptolemy’s time. Cosmos 1980-01-01T00:00:00Z Such jets are indeed observed in a number of galaxies and quasars. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z Such telescopes may reveal the internal structure and nature of quasars. Cosmos 1980-01-01T00:00:00Z It is thought that similar but even larger black holes, with masses of about a hundred million times the mass of the sun, occur at the centers of quasars. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z In that case, the more distant the galaxy, the earlier in its history we are observing it, and the more likely it is that we should see it as a quasar. Cosmos 1980-01-01T00:00:00Z Some remarkable process must be responsible for the vast outpouring of energy in a quasar. Cosmos 1980-01-01T00:00:00Z Whatever the cause of a quasar explosion, one thing seems clear: such a violent event must produce untold havoc. Cosmos 1980-01-01T00:00:00Z Modern radio telescopes are exquisitely sensitive; a distant quasar is so faint that its detected radiation amounts perhaps to a quadrillionth of a watt. Cosmos 1980-01-01T00:00:00Z In considering the quasars, we confront profound mysteries. Cosmos 1980-01-01T00:00:00Z A number of other similar “quasi-stellar objects,” or quasars, have been discovered, all with large red shifts. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z They visited observatories in ancient Estonian cities like Pärnu and Tartu, where Dr. Ozernoy would research astronomical phenomena like quasars and black holes. The Solar System Winked 2020-08-21T04:00:00Z Like much of the album, "The Meditative" loops and warbles like a quasar. 'At Long Last ASAP Rocky' a psychedelic trip through grief 2015-05-30T04:00:00Z Lovell was primarily concerned with investigating cosmic rays, and the observatory has since played a key role in the research of meteors, quasars and pulsars. Doves: "The band are splitting up? Nobody told me!" | Interview 2010-04-03T23:07:00Z His books abound with talk of quasars and quarks, and ponderings on the nature of the strong nuclear force. "Foundation": An introduction to five major themes in the work of sci-fi writer Isaac Asimov 2021-10-09T04:00:00Z It’s twelve billion light years away, but, because the quasar surrounding it glows four hundred and twenty trillion times brighter than the sun, it’s still visible to telescopes on Earth. Liu Cixin Is China’s Answer to Arthur C. Clarke 2015-03-06T05:00:00Z His excellent prose and a powerful story fuel this shining quasar of a book. From Black Holes to Breakfast, Three Books Show How Einstein’s Legacy Lives On 2019-02-05T05:00:00Z His novels — the astonishing “Wind-Up Bird Chronicle,” the sprawling “1Q84” — spiral like galaxies from central cores, but his stories are quasars, exploding with light as they reveal his themes. Eight Ways of Looking at Haruki Murakami 2021-04-06T04:00:00Z For example, light from distant, brilliant galaxies called quasars reveals no sign of extra clumpiness, says Samuel Goldstein, a cosmologist at Columbia University. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z Supermassive black holes may tear apart and devour their disk of surrounding dust and gas at a shocking speed, perhaps explaining the behavior of a mysterious class of rapidly brightening quasar. Supermassive Black Hole Feeding Frenzies May Explain Blinking Quasars 2023-09-28T04:00:00Z The most powerful type of these active galaxies are called "quasars," which are some of the brightest objects in the Universe. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z One mystery Kaaz is particularly interested in is "changing-look quasars," in which black holes feeding on gas at the center of galaxies experience alternating periods of luminosity and darkness. Fast food: Black holes devour stars much quicker than we thought 2023-09-24T04:00:00Z Although classical theory has posed assumptions for how quickly accretion disks evolve and change brightness, observations of changing-look quasars indicate that they actually evolve much, much faster. Black holes eat faster than previously expected 2023-09-20T04:00:00Z A quasar’s spectrum shows a thicket of dark absorption lines, known as the Lyman-alpha forest. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z Though the results come from a computer simulation, not the real thing, this timescale would match observations of so-called changing-look quasars. Supermassive Black Hole Feeding Frenzies May Explain Blinking Quasars 2023-09-28T04:00:00Z Most quasars appear very blue, due to the bright disc of matter that orbits and feeds the central supermassive black hole which is very bright in optical and ultraviolet wavelengths. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z It could be the black hole consuming a portion of its accretion disc causes its light to dim in periods of changing-look quasar darkness. Fast food: Black holes devour stars much quicker than we thought 2023-09-24T04:00:00Z This new finding could help explain the dramatic behavior of some of the brightest objects in the night sky, including quasars, which abruptly flare up and then vanish without explanation. Black holes eat faster than previously expected 2023-09-20T04:00:00Z Each line marks a cloud of hydrogen that lies along the line of sight and soaks up the quasar’s light. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z Changing-look quasars dim and brighten on the order of months, which is a perplexing time line, given the massive scales involved. Supermassive Black Hole Feeding Frenzies May Explain Blinking Quasars 2023-09-28T04:00:00Z These outflows will eventually blow away all the dust and gas in the central region of the galaxy, revealing a blue quasar and resulting in weaker radio emission. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z Theoretical physics predicts that black holes should take billions of years to grow into quasars, which are extra bright and powerful objects powered by black holes. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z They appear to turn on and off over the duration of months -- a tiny amount of time for a typical quasar. Black holes eat faster than previously expected 2023-09-20T04:00:00Z Astronomers have found by far the most distant and earliest quasar ever seen, a cosmic beacon shining so soon after the big bang that standard theory can’t explain how it was built. Giant black hole formed puzzlingly fast at dawn of cosmos 2023-08-22T04:00:00Z Astronomers found evidence of such a ‘cosmic noon’ merger for the first time by detecting a pair of energetic quasars in the same galactic neighbourhood. Fast and Furious starring Dual Quasars 2023-05-03T04:00:00Z This is consistent with the emerging picture that red quasars are a younger, "blow-out" phase in the evolution of galaxies. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z Yet astronomers know that many quasars have formed in only a few hundred million years. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z Not only do the new simulations potentially explain quasars, they also could answer ongoing questions about the mysterious nature of black holes. Black holes eat faster than previously expected 2023-09-20T04:00:00Z Astronomers thought the black holes formed stepwise within early galaxies, as giant stars collapsed and merged, but quasars detected from when the universe was less than 1 billion years old have challenged the idea. Giant black hole formed puzzlingly fast at dawn of cosmos 2023-08-22T04:00:00Z These telescopes calculated how far they are from each other and confirmed that the two objects were both quasars. Fast and Furious starring Dual Quasars 2023-05-03T04:00:00Z Red quasars may therefore be extremely important for understanding how galaxies evolve over time. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z Maybe the most massive quasars are city slickers, forming in hubs of tens or hundreds of other galaxies. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z Scientists think that, sometimes, young black holes can even grow up to become powerful quasars. Cosmic Monsters’ Growth Secret 2023-08-03T04:00:00Z Some theorists already doubted that this stepwise process could produce the earliest quasars, and that much larger seeds were needed. Giant black hole formed puzzlingly fast at dawn of cosmos 2023-08-22T04:00:00Z Image: This artist's impression of a closely bound duo of energetic quasars — the hallmark of a pair of merging galaxies — seen when the Universe was only three billion years old. Fast and Furious starring Dual Quasars 2023-05-03T04:00:00Z They found that quasars that contained more dust, and therefore appeared redder, were more likely to have stronger radio emission compared to the quasars that had very little-to-no dust, appearing very blue. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z Or maybe quasars can grow to huge proportions even in the most desolate regions of the universe. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z He adds that these studies used small samples or observed quasars over a short time period. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z In contrast, quasars seen later in cosmic history are dwarfed by their galaxies, being 0.1% of the mass or less. Giant black hole formed puzzlingly fast at dawn of cosmos 2023-08-22T04:00:00Z Galactic mergers can produce bright quasars that outshine the entire galaxy. Fast and Furious starring Dual Quasars 2023-05-03T04:00:00Z However, astronomers have found that a significant fraction of these quasars appear very red, although the nature of these objects is still not well understood. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z These protocluster structures grow much faster than we thought, too, so we have a second cosmic problem to solve – how do quasars and protoclusters evolve so quickly? Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z In contrast, Lewis and Brewer used a new, much more expansive data set: they looked at 190 quasars in all, covering a range of cosmic time from about 2.5 billion to 12 billion years ago. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z To grow so large compared with its host galaxy and so soon after the big bang, the quasar must have had a head start. Giant black hole formed puzzlingly fast at dawn of cosmos 2023-08-22T04:00:00Z Data shows that for every 100 supermassive black holes, only one should be actively eating at a given time, making the discovery of these dual quasars extremely rare and fascinating! Fast and Furious starring Dual Quasars 2023-05-03T04:00:00Z In order to understand the physics of these red quasars, "spectroscopic" measurements are required, which can be used to analyse the quasar light at different wavelengths. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z We can then look at protoclusters' and quasars' baby pictures to see how they evolved at early times. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z Each quasar’s flickering was observed hundreds of times at multiple wavelengths across a span of two decades. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z Giant gas clouds and dark stars are only two of the scenarios theorists have devised for jump-starting the growth of quasars. Giant black hole formed puzzlingly fast at dawn of cosmos 2023-08-22T04:00:00Z It has checked out asteroids, quasars, exoplanets and other cosmic phenomena galore. A Year of Cosmic Wonder With the James Webb Space Telescope 2023-07-12T04:00:00Z The "shape" of the quasar's spectrum can indicate the amount of dust present surrounding the central region. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z It is only after looking at spectra that astronomers determine whether the galaxies and quasars are actually close together in three-dimensional space. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z The duo also grouped the quasars by intrinsic luminosity. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z Since quasars are powered by supermassive black holes, questions remain about what fuels their rapid growth. Early strings of cosmic web identified by James Webb Space Telescope 2023-07-04T04:00:00Z Researchers observed data from quasars - objects powered by "supermassive" black holes at the centre of early galaxies - using them to measure time near the beginning of the universe. Scientists see early universe in slow-motion for first time 2023-07-04T04:00:00Z Observing the radio emission from quasars can also tell you about the energetics of the central supermassive black hole; whether it is launching powerful "winds" or "jets" that might shape the surrounding galaxy. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z So, for a long time, it was only a prediction that massive quasars might be evolving at the centers of vast galactic cities. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z Katie Mack, an astrophysicist who holds the Hawking Chair in Cosmology and Science Communication at the Perimeter Institute for Theoretical Physics in Ontario, says that these findings provide clarity on various uncertainties surrounding quasar behavior. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z As Fang noted, this early string of galaxies is anchored by a luminous quasar. Early strings of cosmic web identified by James Webb Space Telescope 2023-07-04T04:00:00Z Astrophysicist Prof Lewis and astrostatistician Brendan Brewer, from the University of Auckland, looked at the colours of nearly 200 quasars over 20 years. Scientists see early universe in slow-motion for first time 2023-07-04T04:00:00Z They also find that redder quasars are much more likely to have strong radio emission compared to typical blue quasars. Hidden supermassive black holes reveal their secrets through radio signals 2023-09-25T04:00:00Z The first Webb projects are hoping to look at quasar environments focused on a period about 800 million years after the Big Bang. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z As a next step, he would like to see future studies replicate the analysis with a larger sample of quasars originating from galaxies even deeper in the cosmic past. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z A quasar is an active galactic nucleus that is believed to be energized by a supermassive black hole. Early strings of cosmic web identified by James Webb Space Telescope 2023-07-04T04:00:00Z They were then able to standardise the "ticking" of each quasar. Scientists see early universe in slow-motion for first time 2023-07-04T04:00:00Z Astronomers can track such motions in the Earth’s axis by observing quasars, the bright centres of distant galaxies that constitute practically immobile points of reference. Rampant Groundwater Pumping Has Changed the Tilt of Earth’s Axis 2023-06-21T04:00:00Z This time period is a sweet spot in which astronomers can view these monster quasars and their neighbors using the light emitted by hydrogen and oxygen. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z So Lewis and astrostatistician Brendon Brewer instead investigated much larger, more luminous objects known as quasars—bright astrophysical beacons formed from supermassive black holes gorging on gas at the centers of distant galaxies. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z Astronomers have observed thousands of quasars at far away distances from our galaxy. Early strings of cosmic web identified by James Webb Space Telescope 2023-07-04T04:00:00Z But quasars allowed Prof Lewis and his team to confirm the theory further to a tenth of the age of the universe. Scientists see early universe in slow-motion for first time 2023-07-04T04:00:00Z When these black holes feed on stellar gases that fall into them at high velocities, they can let off incredibly bright emissions known as quasars. Largest-Ever Cosmic Explosion Has Raged for Years 2023-05-16T04:00:00Z The wavelengths of these light features show where the objects emitting them are along our line of sight, allowing astronomers to complete the census of where galaxies live relative to bright quasars. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z Although this variability makes quasars easier to identify, it complicates their use as standard markers of cosmic time. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z But this is the first time astronomers have observed the early formation of the cosmic web in a formation that's fastened by a quasar. Early strings of cosmic web identified by James Webb Space Telescope 2023-07-04T04:00:00Z Another idea t was that it was an outburst from a quasar — energy squirting from the edge of a supermassive black hole at the heart of a galaxy. The Biggest Explosion in the Cosmos Just Keeps Going 2023-05-12T04:00:00Z "With a quasar, we see the brightness flickering up and down over time," team member and University of Southampton professor Mark Sullivan added. Largest-Ever Cosmic Explosion Has Raged for Years 2023-05-16T04:00:00Z In an early paper, they found a protocluster around an extremely bright quasar and confirmed it with 12 galaxies' spectra. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z If supernovae are akin to a firework, burning bright and quickly fading away, then quasars change brightness more like the stock market, with an unpredictable pattern of turbulent flickers. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z "The scale of the wind is related to the structure of the quasar. In the Webb observations, we are seeing that such winds existed in the early universe." Early strings of cosmic web identified by James Webb Space Telescope 2023-07-04T04:00:00Z But there was no record of previous quasar activity at the location, nor was there any visible sign of a galaxy there. The Biggest Explosion in the Cosmos Just Keeps Going 2023-05-12T04:00:00Z Astronomers have used lensing to measure the expansion of the universe before but with quasars—the extremely bright cores of certain galaxies—rather than supernovae. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z Another study detected over a hundred galaxies, looking toward the single most luminous quasar known in the early universe. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z In fact, prior studies have failed to find a time dilation effect between quasars very distant from us and ones relatively close by. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z For sixty since they were first detected, astronomers have puzzled over what quasars were. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z Hot disks of dust and gas swirling down the gravitational drains of monster black holes are what drive quasars, some of the brightest objects in the universe. Earliest galaxies challenge ideas about star birth in infant universe 2023-03-27T04:00:00Z But while quasars may shine for millions of years—essentially forever for us—supernovae are short-lived, shining brightly for just weeks or months. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z Twenty-four of those galaxies were close to the quasar or in its neighborhood. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z “Those early findings inspired some fringe cosmologists to question whether quasars’ variability adheres to our existing models of the universe. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z The term quasar is a concatenation of quasi-stellar radio source — so called because when they were first identified, astronomers like Hong-Yee Chiu, who coined the term, were completely baffled by these strange interstellar objects. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z "Another possibility is that these things are a different kind of weird object, such as faint quasars, which would be just as interesting." The Webb space telescope may have discovered six galaxies that shouldn't exist 2023-02-24T05:00:00Z A top-notch science fiction romance comes along once in a blue quasar, so “The Red Scholar’s Wake” by Aliette de Bodard is worth celebrating. Review | Four sci-fi and fantasy stories about women who survive the worst 2023-01-02T05:00:00Z Once my team has a list of the properties of the galaxies in an area, we'll compare these properties with a control sample of random galaxies in the universe, far away from any quasar. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z “We boxed bright quasars with bright quasars and faint quasars with faint quasars,” Lewis says. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z As we've narrowed it down, we've learned that quasars sit at the center of galaxies, which are giant swirling discs of stars, gas, dust and dark matter strung together by gravity. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z Through his groundbreaking work on quasars, Dr. Schmidt was credited with helping to revolutionize scientists’ understanding of the cosmos. Maarten Schmidt, astronomer who explained quasars, dies at 92 2022-09-26T04:00:00Z And unlike some discoveries of oddities in space, the importance of Schmidt’s work only grew with time, as cosmologists realized the role quasars played in building the modern universe. Maarten Schmidt, Caltech astronomer who changed our understanding of the cosmos, dies 2022-09-23T04:00:00Z If these metrics are different enough from the control, we'll have good evidence that quasars do grow up in special neighborhoods – ones developing much faster than the more sparse regions of the universe. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z Ultimately, the researchers found that the tick-tock of the quasar clocks behaved just as Einstein’s relativity predicts. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z Unfortunately, despite their importance and awe-inspiring destructive power, quasars are difficult to study due to their extreme distance and brightness. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z Hence the name “quasar,” an abbreviation that recognized their starlike properties, and stands for quasi-stellar radio source. Maarten Schmidt, astronomer who explained quasars, dies at 92 2022-09-26T04:00:00Z “The discovery of quasars is one of the fundamental discoveries of astrophysics, and it completely changed astronomy,” said George Djorgovski, astronomy professor and director of the Center for Data Driven Discovery at Caltech. Maarten Schmidt, Caltech astronomer who changed our understanding of the cosmos, dies 2022-09-23T04:00:00Z While astronomers still need more than a handful of quasars to prove this hypothesis on a larger scale, Webb has already opened a window into a bright future of discovery in glorious, high-resolution detail. Powerful black holes might grow up in bustling galactic neighborhoods 2023-09-12T04:00:00Z Specifically, the study confirms that quasars align with consensus expectations—and it reinforces the need for astronomers to consider time dilation when studying them. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z A new study in the journal Monthly Notices of the Royal Astronomical Society sheds light on the question of quasars, essentially solving one of the central mysteries of how quasars form. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z Applying the principle of the cosmological redshift placed the quasar at a distance more than 2 billion light-years away. Maarten Schmidt, astronomer who explained quasars, dies at 92 2022-09-26T04:00:00Z Black holes had been a theoretical concept for some time, but quasars proved their existence in a concrete way. Maarten Schmidt, Caltech astronomer who changed our understanding of the cosmos, dies 2022-09-23T04:00:00Z Lives Lived: Maarten Schmidt was the first astronomer to identify a quasar, then among the farthest known objects from Earth, opening new questions about the universe’s evolution. A Shift in Crime 2022-09-23T04:00:00Z Hawkins himself has previously conducted research that failed to detect time dilation in quasars, which he says underscores the significance of ongoing investigation and refinement in the field. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z As the researchers explain, colliding galaxies appear to create the conditions to birth a quasar. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z Recognizing that the quasar could be found at such a distance gave support for new ideas of the size of the universe, of how infinitely far it extended beyond our solar system and our galaxy. Maarten Schmidt, astronomer who explained quasars, dies at 92 2022-09-26T04:00:00Z It took some time before the scientific community accepted the term quasars. Maarten Schmidt, Caltech astronomer who changed our understanding of the cosmos, dies 2022-09-23T04:00:00Z Researchers called them “quasi-stellar radio sources,” or quasars, for short — even though no one could figure out what a quasar was. Maarten Schmidt, First Astronomer to Identify a Quasar, Dies at 92 2022-09-22T04:00:00Z Accurate timestamping of ancient quasars might also prove useful for further exploring the nature of dark energy, the mysterious force thought responsible for a surprising acceleration in the universe’s expansion. Time Flowed Five Times Slower Shortly after the Big Bang 2023-07-19T04:00:00Z Indeed, these violent interweavings can cause enough gas to flow towards the core supermassive black holes, initiating quasar activity even before the two galaxies fully merge. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z The prize, bestowed by the Norwegian Academy of Science and Letters, was shared with a fellow astronomer who made clear the connection between the quasar and the black hole. Maarten Schmidt, astronomer who explained quasars, dies at 92 2022-09-26T04:00:00Z The more satisfying work came later, when he was able to show where quasars fit on the timeline of the universe. Maarten Schmidt, Caltech astronomer who changed our understanding of the cosmos, dies 2022-09-23T04:00:00Z If that was true, and if quasars really were several billion light years away, it meant that they were portraits of the universe in its relative infancy, just a few billion years old. Maarten Schmidt, First Astronomer to Identify a Quasar, Dies at 92 2022-09-22T04:00:00Z What is the mechanism for the energy output of quasars? College Physics for AP Courses 2015-08-12T00:00:00Z The researchers, led by Jonathon Pierce, a postdoctoral research fellow at the University of Hertfordshire, observed nearly 50 galaxies that are host to quasars and compared them to more than 100 galaxies that are quasar-free. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z Scientists think that quasars harbor black holes and derive their energies from the association with black holes. Maarten Schmidt, astronomer who explained quasars, dies at 92 2022-09-26T04:00:00Z But relatively few, these days, have quasars, or what are now called active galactic nuclei. Maarten Schmidt, Caltech astronomer who changed our understanding of the cosmos, dies 2022-09-23T04:00:00Z The key event that began to change our view of the universe was the discovery of a new class of objects: quasars. Astronomy 2016-10-13T00:00:00Z The best explanation of quasars is that they are young galaxies with a supermassive black hole forming at their core, and that they become less energetic over billions of years. College Physics for AP Courses 2015-08-12T00:00:00Z Similar comparisons have been made many times before, but this marks the first time so many quasars have been imaged with such sensitivity. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z The Milky Way’s black hole is a “gentle giant” compared to the one in M87, which sends quasars shooting across space. The Milky Way’s Black Hole Comes to Light 2022-05-12T04:00:00Z They saw an unmistakable signal: the regions of more intense radio emission overlapped with the positions of known galaxies and quasars. Canadian Telescope Delivers Deepest-Ever Radio View of Cosmic Web 2022-05-04T04:00:00Z Despite this great distance, it is still one of the quasars closest to the Milky Way Galaxy. Astronomy 2016-10-13T00:00:00Z Candidates for black holes may power the extremely energetic emissions of quasars, distant objects that seem to be early stages of galactic evolution. College Physics for AP Courses 2015-08-12T00:00:00Z In the study, the authors said that their images of quasars "provide strong evidence that galaxy interactions are the dominant triggering mechanism for quasars in the local universe." Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z For decades, radio astronomers have tracked minute changes in Earth’s surface rotation—the length of a day—against a cosmic reference frame: the fixed position of distant cosmic beacons called quasars. Scientists are probing the secrets of Earth’s inner core—and how it saved life on our planet 2022-03-30T04:00:00Z From the very beginning, the Compton quasar supplied L.A. with a distinct musical DNA. When it comes to the L.A. sound, don't get it twisted: DJ Quik is still the name 2022-03-15T04:00:00Z Note also the faint streak going toward the upper left from the quasar. Astronomy 2016-10-13T00:00:00Z The fibre-optic system splits light from galaxies, stars and a bright variety of galaxy known as quasars into narrow bands of colour. Durham University fibre-optics help largest 3D map of Universe 2022-01-13T05:00:00Z This, they said, was consistent with quasars of different "brightnesses," meaning with varying strength to their radio emissions. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z By providing a framework to connect luminous infrared galaxies, powerful starbursts, and active galaxies and quasars, it helped renew interest in how galactic mergers influence galaxy evolution over cosmic time. Galaxy Collisions Preview Milky Way’s Fate 2021-11-16T05:00:00Z Astronomers have found quasars less than 700 million years after the big bang, but many think they are too few and far between to evenly ionize all of space. On the launch pad at last, NASA’s Webb telescope will probe first stars and weather on alien worlds 2021-11-11T05:00:00Z Suppose a distant quasar has a redshift of 5. Astronomy 2016-10-13T00:00:00Z As part of a search for mysterious radio sources known as quasars, the telescope recorded the signals of distant radio waves, which were registered on chart paper as crests and troughs. Antony Hewish, astronomer who won Nobel Prize for the discovery of pulsars, dies at 97 2021-09-17T04:00:00Z All quasars are extremely far away, which means that they are also in the distant past, because of the way that distance correlates with earlier points of time as we gaze at far-away objects. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z The proposed connection between powerful infrared galaxies and quasars, two types of celestial objects that are seemingly very different, provided a testable model that spurred research on the relation between these apparently disparate classes. Galaxy Collisions Preview Milky Way’s Fate 2021-11-16T05:00:00Z The quasars spotted so far are huge, with masses equivalent to 1 billion Suns, which means many smaller ones remain to be discovered, Finkelstein says. On the launch pad at last, NASA’s Webb telescope will probe first stars and weather on alien worlds 2021-11-11T05:00:00Z A wide range of studies with the Hubble Space Telescope now clearly demonstrate that quasars are indeed far away. Astronomy 2016-10-13T00:00:00Z The line of sight to distant quasars crosses numerous hydrogen clouds. Watching the Universe Expand in Real Time 2021-05-06T04:00:00Z However, there may be a quasar nearby in a few billion years, if you can wait that long. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z Other researchers will use the observatory to target nearby, bright active galaxies, distant quasars and deep, blank fields in search of the earliest galaxies. Galaxy Collisions Preview Milky Way’s Fate 2021-11-16T05:00:00Z Mazzucchelli said astronomers usually expect to find quasars with radio jets in a certain kind of galactic environment — "surrounded by overdensities of galaxies that will evolve in the clusters of galaxies that we see nowadays." Astronomers hope to use a quasar as a "flashlight" to see into the universe's dark past 2021-03-12T05:00:00Z Interestingly, many quasar host galaxies are found to be involved in a collision with a second galaxy, providing, as we shall see, an important clue to the source of their prodigious energy output. Astronomy 2016-10-13T00:00:00Z Each of these clouds imprints an absorption feature on the observed spectrum of the quasar light. Watching the Universe Expand in Real Time 2021-05-06T04:00:00Z As the Milky Way collides with the Andromeda galaxy in a protracted process that will occur in roughly five billion years, the aftermath is likely to produce a quasar. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z A quarter of a century later, Maarten Schmidt discovered quasars as powerful sources of light at cosmological distances. Did a Supermassive Black Hole Influence the Evolution of Life on Earth? 2021-01-31T05:00:00Z The discovery in the 1960s of quasars in the centers of galaxies first led astronomers to consider that supermassive black holes were responsible for such fireworks. Missing: One Black Hole With 10 Billion Solar Masses 2021-01-19T05:00:00Z The Hubble Space Telescope reveals the much fainter “host” galaxies around quasars. Astronomy 2016-10-13T00:00:00Z Similar reasoning suggested quasars, distant galaxies spewing radiation, are powered by supermassive black holes in their centers. After decades of effort, scientists are finally seeing black holes—or are they? 2021-01-07T05:00:00Z It's taken decades of work to get where we are now with our understanding of quasars, which is fundamental to shaping our theories on how the universe formed and where it's heading. Scientists solved a six-decade mystery about the brightest, most powerful objects in the universe 2023-04-30T04:00:00Z High feeding rates make quasars visible all the way out to the edge of the visible Universe. Did a Supermassive Black Hole Influence the Evolution of Life on Earth? 2021-01-31T05:00:00Z Like stars, quasars appear as points of light. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z Each of the right images shows long tails of gas and dust streaming away from a galaxy that contains a quasar. Astronomy 2016-10-13T00:00:00Z The discovery of quasars more than half a century ago implied that supermassive black holes form generically at the centers of galaxies. Black Holes Are Finally Trending 2020-11-07T05:00:00Z Avi Loeb, chair of Harvard's astronomy department, told Salon via email that the concentration of galaxies are "in the neighborhood of a luminous quasar when the universe was about a billion years old." Observation of ancient galaxies provides new clues as to how supermassive black holes form 2020-10-11T04:00:00Z The quasars resemble a baby that tends to remove food off the dining table as soon as it is fed by virtue of becoming too energetic. Did a Supermassive Black Hole Influence the Evolution of Life on Earth? 2021-01-31T05:00:00Z Many of the quasar measurements are accurate to about a hundred-millionth of a degree—smaller than the apparent size of a basketball on the Moon. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z The most dramatic changes in quasar brightness are equivalent to the energy released by 100,000 billion Suns. Astronomy 2016-10-13T00:00:00Z More than 2 billion galaxies and quasars were measured for the project, spanning 11 billion years of cosmic time. Huge 3D-map of the universe revealed 2020-07-23T04:00:00Z "The bright quasar is fueled by the infall of gas onto a massive black hole, weighing over a billion Suns," Loeb told Salon. Observation of ancient galaxies provides new clues as to how supermassive black holes form 2020-10-11T04:00:00Z "The former is a reasonable length scale for a supernova remnant, whereas the latter is a reasonable scale for the reach of the jets produced by the most powerful quasars." Astronomers perplexed by "Odd Radio Circles," a new class of cosmic phenomenon 2020-07-13T04:00:00Z The growing number of rock-solid quasars, now in the thousands, also transformed interplanetary navigation. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z We can apply this idea to brightness changes in quasars to estimate their diameters. Astronomy 2016-10-13T00:00:00Z The team began monitoring quasars in the those regions for unusual activity. Two Black Holes Colliding Not Enough? Make It Three 2020-06-25T04:00:00Z "As a result, one expects the environment of the quasar to be denser than average with a concentration of additional galaxies," Loeb said. Observation of ancient galaxies provides new clues as to how supermassive black holes form 2020-10-11T04:00:00Z Graham and his team study really active supermassive black holes in galaxies — known as quasars — and they’d been noticing a weird trend. Astronomers see first light flare from two distant black holes colliding 2020-06-25T04:00:00Z But quasars are faint specks at those wavelengths, and optical telescopes peering through Earth’s blurry atmosphere struggled to match the precision of radio arrays. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z And some quasars vary even more rapidly, which means their energy is generated in an even smaller region. Astronomy 2016-10-13T00:00:00Z The trail from the May gravitational wave event led to a quasar known as J124942.3+344929, located about 4 billion light years from Earth. Two Black Holes Colliding Not Enough? Make It Three 2020-06-25T04:00:00Z Dr. Wolfe concentrated on detecting the gas in the protogalaxy disks by seeing how it affected the light from even more distant quasars. The Galaxy That Grew Up Too Fast 2020-05-20T04:00:00Z "The light from the quasar was absorbed as it passed through a massive reservoir of hydrogen gas surrounding the galaxy, which is how it revealed itself," the researchers explained, in the statement. Massive, rotating disk galaxy from the early universe discovered 2020-05-21T04:00:00Z “Ninety-eight percent of that work was obliterated after the Gaia release,” says Leonid Petrov, an astronomer at NASA’s Goddard Space Flight Center who conducts radio quasar observations to build reference frames. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z Some quasars are observed to be shooting out pairs of straight jets at close to the speed of light, in a tight beam, to distances far beyond the galaxies they live in. Astronomy 2016-10-13T00:00:00Z As light from a quasar passes through a foreground galaxy, the gas from that galaxy absorbs some of the light, creating what Neeleman calls “shadows.” Astronomers Get Earliest Ever Glimpse of Ancient Giant Galaxy 2020-05-20T04:00:00Z “The quasars act like flashlights for us to observe the universe between us and the quasar,” Dr. Prochaska said. The Galaxy That Grew Up Too Fast 2020-05-20T04:00:00Z Their belches produce the fireworks we call quasars. Deep in the Cosmic Forest, a Black Hole Goldilocks Might Like 2020-05-06T04:00:00Z These stars, anchored to the quasar-based grid, are useful guides for spacecraft with simple star trackers, or when no quasar is visible in a particular part of the sky. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z As we shall see later in this chapter, quasars were much more common when the universe was young than they are today. Astronomy 2016-10-13T00:00:00Z By using quasars, the team hoped to overcome the observing bias faced by previous studies. Astronomers Get Earliest Ever Glimpse of Ancient Giant Galaxy 2020-05-20T04:00:00Z Astronomers were surprised to find a perpendicular structure in the region of the quasar’s accretion disk where the jets are ejected.J.Y. Daily briefing: Two breakthroughs add to ‘grand unifying theory of maths’ 2020-04-06T04:00:00Z Burbidge also researched quasars, or supermassive black holes that create high-speed jets, including using data gathered by the Hubble Space Telescope on such objects. Margaret Burbidge, Astronomer Who Studied the Inner Workings of Stars, Dies at 100 2020-04-08T04:00:00Z After that, the stars will meander relative to background quasars unless astronomers dispatch a follow-up mission to remap the sky. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z The readers of this text are in a much better position than the astronomers who discovered quasars in the 1960s to guess what powers the quasars. Astronomy 2016-10-13T00:00:00Z The extended disks created by cool galaxies are more likely to obscure a quasar than a more compact galaxy might. Astronomers Get Earliest Ever Glimpse of Ancient Giant Galaxy 2020-05-20T04:00:00Z Described as “the most energetic outflows ever witnessed in the universe,” they emanate from quasars, distant bright objects in space that are similar to stars. NASA’s Hubble space telescope spots quasar tsunamis ripping across galaxies 2020-03-20T04:00:00Z Paradoxically, belching black holes are the brightest objects in the universe, producing the fireworks known as quasars and other violent phenomena. This Black Hole Blew a Hole in the Cosmos 2020-03-06T05:00:00Z Next week, on 3 December, Gaia will release, along with the latest data about billions of Milky Way stars, its newest reference frame, built from 1.6 million quasars scattered across the sky. Precise maps of millions of bright quasars show our place in the cosmos as never before 2020-11-24T05:00:00Z The discovery of the first stellar mass black hole in the binary system Cygnus X-1 was announced in 1971, several years after the discovery of quasars. Astronomy 2016-10-13T00:00:00Z The find is significant since the galaxy is powered by a quasar, a highly active supermassive black hole. Molecular oxygen discovered in another galaxy for first time ever 2020-02-20T05:00:00Z The outflows “tear across interstellar space like tsunamis, wreaking havoc on the galaxies in which the quasars live,” said NASA, in a statement. NASA’s Hubble space telescope spots quasar tsunamis ripping across galaxies 2020-03-20T04:00:00Z Some, known as quasars or active galactic nuclei, shine brightly from across the universe as they continuously devour surrounding gas. Black holes caught in the act of swallowing stars 2020-01-28T05:00:00Z But Marcote and colleagues’ results argue against that possibility, and the timescales for quasar variability are more likely to be days to months than milliseconds. Not all fast radio bursts are created equal 2020-01-05T05:00:00Z It was only as proof of the existence of black holes accumulated over several decades that it became clearer that only supermassive black holes could account for all the observed properties of quasars and AGNs. Astronomy 2016-10-13T00:00:00Z Quasars are considered the brightest objects in the universe and the quasar at the center of Markarian 231 is the closest one to Earth. Molecular oxygen discovered in another galaxy for first time ever 2020-02-20T05:00:00Z “Aside from measuring the most energetic quasars ever observed, the team also discovered another outflow accelerating faster than any other,” scientists said, in the statement. NASA’s Hubble space telescope spots quasar tsunamis ripping across galaxies 2020-03-20T04:00:00Z They revealed the Big Bang, black holes and quasars. Will the United States Lose the Universe? 2019-12-23T05:00:00Z Since the discovery of the first known changing-look quasar in 2014, astronomers have chased down more of these oddballs—some of which appear to rapidly brighten as a galaxy suddenly flares into a luminous quasar. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z For quasars, the emission in visible light varies on typical time scales of 5 to 2000 days, limiting the size of the disk to that many light-days. Astronomy 2016-10-13T00:00:00Z When I’m surfing the web I want to be drawn in by articles on Europe’s political history or the nature of quasars, but I end up reading trivia like a menu from Alcatraz prison. Opinion | Why Aren’t We Curious About the Things We Want to Be Curious About? 2019-10-18T04:00:00Z Astronomers were surprised to see the “mild-mannered” galaxies suddenly turn into “ravenous” quasars. 'Dramatic' black holes stun scientists as 'wimpy' galaxies quickly transform into 'ravenous' quasars 2019-09-19T04:00:00Z And in the 1940s, his search with Milton Humason for white dwarfs — another class of dense stellar remnants — gave early hints of the highly energetic outbursts that came to be known as quasars. Deciphering dark matter: the remarkable life of Fritz Zwicky 2019-09-02T04:00:00Z In a quasar, visible light mostly emanates from the accretion disk, whereas infrared light predominantly comes from a larger outlying torus—a doughnut-shaped ring of dust that envelops the accretion disk. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z In the X-ray band, quasars vary even more rapidly, so the light travel time argument tells us that this more energetic radiation is generated in an even smaller region. Astronomy 2016-10-13T00:00:00Z That sounds logical, but a search for “quasars” will yield thousands of hits and no way of knowing which offers the just-right match to your current knowledge that will maintain your curiosity. Opinion | Why Aren’t We Curious About the Things We Want to Be Curious About? 2019-10-18T04:00:00Z “But we later found it was a previously dormant black hole undergoing a transition that astronomers call a ‘changing look,’ resulting in a bright quasar. 'Dramatic' black holes stun scientists as 'wimpy' galaxies quickly transform into 'ravenous' quasars 2019-09-19T04:00:00Z For instance, in very active galactic nuclei and quasars the accretion flow is very important and the disk is probably thick. Here’s what scientists think a black hole looks like 2019-04-08T04:00:00Z That is sufficient proof, the paper’s authors say, to conclude that the observed change is intrinsic to a quasar itself rather than being the result of some external event or force. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z If the quasar mechanism involves a great deal of mass, then the only astronomical object that can confine a lot of mass into a very small space is a black hole. Astronomy 2016-10-13T00:00:00Z As standard candles, quasars aren’t ideal because their masses vary widely. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z A recent study of 1,598 distant quasars using NASA’s Chandra X-Ray Observatory offers intriguing, if preliminary, evidence for the latter interpretation. Have We Mismeasured the Universe? 2019-02-06T05:00:00Z The newly discovered quasar, catalogued as J043947.08+163415.7, is so old that the light from it started its journey when the universe was only about a billion years old. Hubble loses best camera but discovers brightest ever quasar 2019-01-09T05:00:00Z Instead astronomers say the evidence shows the quasars themselves are changing. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z Most black holes don’t show any signs of quasar emission. Astronomy 2016-10-13T00:00:00Z Nevertheless, the researchers identified some regularities in the emissions from quasars, allowing the history of the cosmos to be traced back nearly 12 billion years. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z "We targeted quasars where previous researchers had only seen shadows from hydrogen and not from heavy elements in lower-quality spectra," Robert added. 'Fossil' cloud made up of pure hydrogen could be remnants of the Big Bang 2019-01-04T05:00:00Z A quasar is the extremely bright nucleus of an active galaxy and its powerful glow is created by the incredible amounts of energy released by gas falling towards the supermassive black hole at its centre. Hubble loses best camera but discovers brightest ever quasar 2019-01-09T05:00:00Z California Institute of Technology astronomer Matthew Graham and his colleagues have nearly tripled the number of known “changing-look” quasars—all of which clearly display sweeping changes in their accretion disk. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z Good overview of how quasars fit into cosmic history. Astronomy 2016-10-13T00:00:00Z Einstein demonstrated beyond a doubt the importance of x-ray imaging, finding that essentially all types of astronomical objects and systems, from nearby stars to distant quasars, emit x-rays. Remembering Riccardo Giacconi: A Titan of the Heroic Age of Astronomy 2018-12-31T05:00:00Z Blazars are quasars whose high-energy beams happen to point right at Earth. All the Light There Is to See? 4 x 10⁸⁴ Photons 2018-12-03T05:00:00Z Although the basic mechanism that powers a quasar is known, the anatomy of the supermassive black hole and its surroundings is not well understood. A glimpse into the heart of a quasar 2018-11-27T05:00:00Z “I would not be surprised at all if changing-look quasars are due to a variety of things,” he says. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z This brief “backgrounder” from the public information office at the HubbleSite gives a bit of the history of the discovery and understanding of quasars. Astronomy 2016-10-13T00:00:00Z The team used random fluctuations in the light from quasars to determine how the photons were measured. Photons, Quasars and the Possibility of Free Will 2018-11-21T05:00:00Z One possible explanation for the apparent lack of a link between quasars and merging galaxies is that gas and dust swirling around these galaxies is likely to heavily obscure the black holes. Supermassive Black Holes Collide in Galactic Merger Grand Finales 2018-11-07T05:00:00Z It is important to keep in mind that the results presented in the paper are based on one particular quasar. A glimpse into the heart of a quasar 2018-11-27T05:00:00Z Perhaps, it was suggested, dust clouds passing in front of the quasars temporarily blocked them from view. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z When quasars were first discovered and the source of their great energy was unknown, some astronomers searched for evidence that quasars are much nearer to us than their redshifts imply. Astronomy 2016-10-13T00:00:00Z The explosive configuration is based on complex scientific models of quasars, galaxies and the creation of the universe. Review: Helen Molesworth's final show at MOCA is the anti-celebrity show we need right now - Los Angeles Times 2018-10-19T04:00:00Z Bell Burnell joined Cambridge's radio astronomy department, where her adviser, Hewish, was on the hunt for quasars — incredibly bright objects in the distant sky whose origins were then unknown. She made the discovery, but a man got the Nobel. A half-century later, she’s won a $3 million prize. 2018-09-08T04:00:00Z We peruse dark energy, radio waves and quasars — beacon-like galaxies in which supermassive black holes feed off interstellar gas and release vast amounts of energy. Ode to a tiny porpoise, a kaleidoscopic tour of light, and a visit to the fossil market: Books in brief 2018-09-03T04:00:00Z Then they searched for galaxies that morphed into a quasar. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z At first, he was given time on the world’s largest telescope, but eventually it became clearer that quasars were just the centers of active galaxies and that their redshifts really did indicate distance. Astronomy 2016-10-13T00:00:00Z Blazars, like quasars, are distant cosmic beacons powered by supermassive black holes, which generate intense radiation and fire jets of particles from their poles. Ghostly particle caught in polar ice ushers in new way to look at the universe 2018-07-12T04:00:00Z Would we not see them, and the quasars they produce, nearby in the modern universe? Readers Respond to the February 2018 Issue 2018-06-02T04:00:00Z It was one of many potential quasars that showed up in the SkyMapper Southern Sky Survey being performed by Dr. Wolf and his colleagues, but so do many stars. A Very Hungry Black Hole Is Found, Gorging on Stars 2018-05-17T04:00:00Z Overall, the team found 111 rapidly changing quasars to compliment the 60 or so already known. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z Before we understood that the energy of quasars comes from supermassive black holes, astronomers were baffled by how such small regions could give off so much energy. Astronomy 2016-10-13T00:00:00Z Not to mention measurements of almost half a million quasars, asteroids and other flecks in the night. Gaia’s Map of 1.3 Billion Stars Makes for a Milky Way in a Bottle 2018-05-01T04:00:00Z But these local monsters are no longer feeding on gas, so they do not glow as quasars. Readers Respond to the February 2018 Issue 2018-06-02T04:00:00Z This network of quasars provides a celestial reference frame to better situate our solar system and the Milky Way within the cosmic landscape. The Milky Way, Revealed as Never Before 2018-04-25T04:00:00Z As such, the team argues that instead of “changing-look,” these quasars would better be called “changing-state” to reflect the true nature of their origins. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z Describe the process by which the action of a black hole can explain the energy radiated by quasars. Astronomy 2016-10-13T00:00:00Z The galaxy is home to a quasar, an extremely bright source of light thought to be created when a very large black hole accelerates material around it. Did We Just Find Exoplanets in Another Galaxy? 2018-02-09T05:00:00Z Initially seen as mysterious sources of extreme luminosity, quasars are now known to be supermassive black holes that are voraciously consuming gas from their immediate surroundings, emitting large amounts of radiation in the process. A beacon at the dawn of the Universe 2018-01-23T05:00:00Z Looking at the very distant, very ancient universe, we find quasars—extremely bright cosmic lights powered by gas falling onto supermassive black holes. Depths of Space, Oceans and Politics 2018-01-16T05:00:00Z Nomenclature aside, the crux of the mystery remains: How, exactly, can an entire quasar suddenly go dark? Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z This idea was rejected, because no quasars with large blueshifts have been found. Astronomy 2016-10-13T00:00:00Z Light from the background quasar splits into four paths, creating four images of the quasar. Did We Just Find Exoplanets in Another Galaxy? 2018-02-09T05:00:00Z For the first few hundred million years, the Universe was devoid of any sources of light — no stars, galaxies or quasars existed. A beacon at the dawn of the Universe 2018-01-23T05:00:00Z Indeed, a recent measurement of time delays in quasars that is completely independent of the cosmic distance ladder data gets very similar results to Dr Riess's late Universe Hubble Constant. Expanding cosmos hints at new physics 2018-01-11T05:00:00Z Still, the exact mechanism at work in the case of the disappearing quasars remains unknown. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z Explain why we would expect to see quasars with both blueshifted and redshifted lines if they were ejected from nearby galaxies. Astronomy 2016-10-13T00:00:00Z Instead of using a quasar, astronomers applying this method usually examine two stars that temporarily line up with one another as seen from Earth. Did We Just Find Exoplanets in Another Galaxy? 2018-02-09T05:00:00Z However, a single quasar is insufficient for providing a complete picture of the Universe in the reionization era or of the evolution and growth of supermassive black holes from initial seeds. A beacon at the dawn of the Universe 2018-01-23T05:00:00Z Astronomers on Wednesday said the black hole, residing at the center of a highly luminous celestial object called a quasar, is located about 13.1 billion light years away from Earth. Colossal distant black hole holds surprises about early universe 2017-12-06T05:00:00Z Every new curiosity in astronomy—even quasars themselves, which were discovered in the mid-20th century—first enters the field in a number of “gee-whiz” papers chiefly pointing out their oddity. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z How could we determine whether or not this was a newly discovered quasar and not some nearby radio transmission? Astronomy 2016-10-13T00:00:00Z Prior to this discovery, the record-holder for the furthest known quasar existed when the Universe was about 800 million years old. Farthest monster black hole found 2017-12-06T05:00:00Z However, to really learn more about the epoch of reionization, scientists need more than just one or two early, distant quasars to look at. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z Astronomers on Wednesday said the black hole, residing at the center of a highly luminous celestial object called a quasar, is located about 13.1 billion light years away from Earth. Colossal distant black hole holds surprises about early universe 2017-12-06T05:00:00Z In the new sample, every flagged quasar first displayed a change in visible light, followed by a change in infrared light. Lights Out: Astronomers Illuminate the Mystery of Vanishing Quasars 2019-12-12T05:00:00Z If a quasar is moving away from us at v/c = 0.8, what is the measured redshift? Astronomy 2016-10-13T00:00:00Z This is no ordinary black hole either, but an active one known as a quasar that’s surrounded by a super bright, highly energetic disk of swirling gas and dust. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z The researchers searched one-tenth of the entire sky visible from Earth and found just one quasar from this early epoch. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z Over time, a galaxy that hosted a stable quasar for long periods may look very different to one with a quasar that behaved unpredictably. Clues emerge in mystery of flickering quasars 2017-07-27T04:00:00Z A new study, posted on the preprint server arXiv and submitted to Monthly Notices of the Royal Astronomical Society, provides the first calculations that show when, where and how planets are harmed by quasars. Ravenous Supermassive Black Holes May Sterilize Nearby Planets 2017-05-30T04:00:00Z In this way, quasars and other kinds of AGN can play a crucial role in the evolution of their galaxies. Astronomy 2016-10-13T00:00:00Z By studying the light from this object, the astronomers found that much of the hydrogen around the quasar was still neutral. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z The new findings revealed that a large fraction of the hydrogen in the immediate vicinity of the newfound quasar was neutrally charged. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z Some of the brightest objects in the Universe — quasars — are vanishing rapidly. Clues emerge in mystery of flickering quasars 2017-07-27T04:00:00Z Although quasars are known to drive strong winds and jets of relativistic particles that can be dangerous in their own right, Forbes and Loeb looked at the damage caused by their light alone. Ravenous Supermassive Black Holes May Sterilize Nearby Planets 2017-05-30T04:00:00Z While our black hole doesn’t have the mass or energy of the quasar black holes, the mechanism that powers them is similar. Astronomy 2016-10-13T00:00:00Z That’s why the astronomers plan to keep searching for distant quasars like this one to better understand what was around back then. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z The researchers predicted that only 20 to 100 quasars as bright and as distant as the newfound quasar exist in the whole sky visible from Earth. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z The discovery set in motion the hunt for more of these ‘changing-look’ quasars. Clues emerge in mystery of flickering quasars 2017-07-27T04:00:00Z Typically, this band has been calculated based on supernovae explosions, gamma-ray bursts and even metallicity, but never the distance from the quasar. Ravenous Supermassive Black Holes May Sterilize Nearby Planets 2017-05-30T04:00:00Z This is enough to account for the total energy of a quasar. Astronomy 2016-10-13T00:00:00Z And the search is still on to find more distant quasars, possibly ones that existed at an even earlier time. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z "This particular quasar is so bright that it will become a gold mine for follow-up studies and will be a crucial laboratory to study the early universe," Bañados told Space.com. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z Some of this light is polarized as it passes through regions around the quasar that are thought to be rich in electrons, just as molecules in Earth's atmosphere scatter and polarize light from the Sun. Clues emerge in mystery of flickering quasars 2017-07-27T04:00:00Z Although many astronomers have speculated these behemoths, called quasars when they are active, would likely wreak havoc on any nearby planets, no one had taken a quantitative look at those effects—until now. Ravenous Supermassive Black Holes May Sterilize Nearby Planets 2017-05-30T04:00:00Z The next challenge, then, is to “weigh” this central mass in a quasar. Astronomy 2016-10-13T00:00:00Z So they believe that this quasar existed right in the middle of the Epoch of Reionization. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z "We need to find more of these quasars at similar or larger distances," Bañados said. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z But the team did not detect an increase in polarized light from the quasar once it started dimming. Clues emerge in mystery of flickering quasars 2017-07-27T04:00:00Z This wasn't unusual — a quasar is the nucleus of a galaxy, and it's bright because of the disk of gas that surrounds the black hole at its center. This black hole is being pushed around its galaxy by gravitational waves 2017-03-24T04:00:00Z With this black hole model, we have come a long way toward understanding the quasars and active galaxies that seemed very mysterious only a few decades ago. Astronomy 2016-10-13T00:00:00Z There are still some aspects of this quasar that puzzle astronomers, though. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z The farthest quasars are also the earliest known quasars—the more distant one is, the more time its light took to reach Earth. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z Or maybe a star passed too close to the black hole and was rapidly torn apart, causing a bright flare that scientists mistook for a quasar. Clues emerge in mystery of flickering quasars 2017-07-27T04:00:00Z Around massive galaxy clusters, gravity itself warps space, forming a giant lens that can bend light from a more distant light source, like a quasar. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z As you can see, the drop-off in the numbers of quasars as time gets nearer to the present day is quite abrupt. Astronomy 2016-10-13T00:00:00Z However, it’s basically impossible to see the visible light from these objects, since quasars are super far away from Earth. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z Only about 60 million years separate this newfound quasar from the previous record holder. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z But LaMassa, who was one of the chairs of the first conference on changing-look quasars in July along with Ross, thinks that the field is on the right track. Clues emerge in mystery of flickering quasars 2017-07-27T04:00:00Z If the alignment of the lens and quasar is just right, the light can follow several paths to Earth, creating multiple images around the lensing cluster. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z This means that we would expect that the number and luminosity of quasars powered in this way would decline with time. Astronomy 2016-10-13T00:00:00Z They estimate that there are just 20 to 100 quasars at these incredibly extreme distances across the entire sky. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z Still, the fact that this newfound quasar is so bright and large suggests that "it's probably not the first quasar ever formed, so we need to keep searching," Bañados said. Oldest Supermassive Black Hole Found from Universe's Infancy 2017-12-06T05:00:00Z Today, however, scientists keep track of it by aiming a network of radio telescopes at a distant quasar. 2017 leapt into the new year with an extra second of time 2017-01-01T05:00:00Z In even luckier circumstances, the quasar flickers in brightness. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z This stream quickly forms an accretion disk that gives off energy in the normal way and makes the black hole region into a temporary quasar. Astronomy 2016-10-13T00:00:00Z Since the Universe is expanding, distant quasars are moving away from Earth, causing their light to stretch into even longer wavelengths and get “redder.” The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z It’s possible it was a message from another civilization or just the effect of a natural space object, like a pulsating quasar. Astronomers have picked up a strong radio signal from space — but it doesn't mean aliens 2016-08-29T04:00:00Z The telescope will, of course, be put to more serious uses: searching for extraterrestrial life and exotica of the Universe such as pulsars, quasars, and gravitational waves. China has built a radio telescope the size of 30 soccer fields to look for aliens 2016-07-04T04:00:00Z Interest in the subject revived with the discovery of distant objects, called quasars. Stephen Hawking’s Reith lecture: Annotated transcript - BBC News 2016-01-26T05:00:00Z And most of them have quasars inside them, not easily visible to us because they are buried by enormous amounts of dust and gas. Astronomy 2016-10-13T00:00:00Z An artistic rendering of the discovery of this most distant quasar, surrounded by neutral hydrogen. The most distant supermassive black hole ever found holds secrets to the early Universe 2017-12-06T05:00:00Z When astronomers point their telescopes up at the sky to see distant supernovae or quasars, they’re collecting light that’s traveled millions or even billions of light-years through space. Building a Mirror for One of the World's Biggest Telescopes 2016-01-15T05:00:00Z But this would have taken much longer than a few years for something as big as a quasar. The quasar that switched off the light 2016-01-08T05:00:00Z To probe the cloud, the team used an even more distant quasar—a hugely bright light source powered by a supermassive black hole—as a backlight. Astronomers find debris from earliest stars 2016-01-07T05:00:00Z Some may veer close enough to the black hole in one galaxy or the other to be devoured by it and so provide the necessary fuel to power a quasar. Astronomy 2016-10-13T00:00:00Z For example, the pioneers of radio astronomy had no inkling that they would discover a universe full of quasars—and thus black holes. The most beautiful theory 2015-11-25T05:00:00Z She was digging through data from the Sloan Digital Sky Survey when she found that a quasar had dimmed in brightness by a factor of six in just 10 years. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z “What this work shows is that quasars can change pretty dramatically on even shorter timescales of a few years.” The quasar that switched off the light 2016-01-08T05:00:00Z They might be an anomalous pulsar or a quasar that shows odd variability. Computers Would Never Have Found 'Alien Superstructure' Star--It Required Citizen Science 2015-10-21T04:00:00Z Is it likely to ever be as luminous as a quasar? Astronomy 2016-10-13T00:00:00Z The astronomers dubbed them quasars, and wondered what could possibly produce radio signals with the power of hundreds of billions of stars from a volume little bigger than a solar system. The most beautiful theory 2015-11-25T05:00:00Z Astronomers suspect that all quasars, which were common in the early universe, will eventually transition into humdrum galaxies. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z Over the past year, the team has found a dozen other quasars that similarly blinked out, earning them the name “changing-look” quasars. The quasar that switched off the light 2016-01-08T05:00:00Z Eventually, scientists settled on the explanation that is widely accepted today: quasars, radio galaxies, and other active galactic nuclei are all powered by raging supermassive black holes. Why Colliding Galaxies Never Go out of Style 2015-10-15T04:00:00Z A friend tries to convince you that she can easily see a quasar in her backyard telescope. Astronomy 2016-10-13T00:00:00Z Some of that matter would be squirted out along the axis of rotation, forming the jets seen in radio observations of quasars. The most beautiful theory 2015-11-25T05:00:00Z Naturally, active galactic nuclei can turn inactive: Over tens of thousands of years black holes run out of gas and dust to eat, so quasars dim and grow quiescent. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z Recent theoretical and observational work has suggested that quasars “flicker” on scales of a few hundred thousand years. The quasar that switched off the light 2016-01-08T05:00:00Z The biggest, brightest quasars are probably the result of galactic collisions, but for smaller galaxies and dimmer quasars the situation is less clear. Why Colliding Galaxies Never Go out of Style 2015-10-15T04:00:00Z If a quasar has a redshift of 3.3, at what fraction of the speed of light is it moving away from us? Astronomy 2016-10-13T00:00:00Z The telescope was designed by project lead Anthony Hewish to detect interplanetary scintillation in an effort to learn more about quasars. Pop Culture Pulsar: The Science Behind Joy Division's Unknown Pleasures Album Cover 2015-10-13T04:00:00Z So when LaMassa presented her results at the January 2015 American Astronomical Society meeting in Seattle, it set in motion a rush among the astronomical community to explain her disappearing quasar—and find new ones. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z The black holes at the heart of quasars have disks of gas and dust orbiting around them, and it’s the innermost part of the disk that burns brightest just before it is sucked in. The quasar that switched off the light 2016-01-08T05:00:00Z It also aligned in a serendipitous way with reading I’d been doing on the history of research into radio galaxies, quasars, and black holes. Why Colliding Galaxies Never Go out of Style 2015-10-15T04:00:00Z Rapid variability in quasars indicates that the region in which the energy is generated must be small. Astronomy 2016-10-13T00:00:00Z It was unlike any of the scintillation patterns that she was searching for in the course of the team’s quasar research. Pop Culture Pulsar: The Science Behind Joy Division's Unknown Pleasures Album Cover 2015-10-13T04:00:00Z Krolik thinks that this lonely quasar blazed back into existence for the same reason that it flickered out: a variation in the gas and dust flowing onto the black hole. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z The team also used their model to predict how ultraviolet light emitted by the quasar would vary and then checked their result against 20 years of data. Flickering Quasar May Hold Black Holes on Collision Course 2015-09-22T04:00:00Z In the 1950s, when astronomers discovered the first active galactic nuclei—radio galaxies, which are generally closer to us and less extreme than quasars—they thought they were seeing two galaxies collide. Why Colliding Galaxies Never Go out of Style 2015-10-15T04:00:00Z Would this line be observable with a ground-based telescope in a quasar with zero redshift? Astronomy 2016-10-13T00:00:00Z By comparison, natural sources of cosmic noise – quasars, pulsars or the gas in the Milky Way – typically emit broad-band signals. Can Yuri Milner Find Intelligent Extraterrestrial Beings? 2015-07-20T04:00:00Z Its spectrum changed, too, from that of a classic quasar to a regular galaxy. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z This quasar, cumbersomely labeled PG 1302-102, along with more than 100 other quasars exhibiting unusual periodic behavior were discovered by a team of researchers at California Institute of Technology. Flickering Quasar May Hold Black Holes on Collision Course 2015-09-22T04:00:00Z Theorists revived the colliding-galaxy hypothesis in the 1980s to explain how quasars differ from other galaxies. Why Colliding Galaxies Never Go out of Style 2015-10-15T04:00:00Z The composition of this gas in quasars that emitted their light 12.5 billion light-years ago is very similar to that of the Sun. Astronomy 2016-10-13T00:00:00Z Trilobites simply don’t have the same star power as black holes and quasars. New York State’s Paleontologist Seeks to Bring Prehistoric Era to Life 2015-07-12T04:00:00Z What LaMassa and her colleagues doubted was that a quasar could go from active to inactive in just 10 years. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z But in this case, unusually regular, or periodic, light emissions were seen, suggesting that a black hole binary might call the quasar home. Flickering Quasar May Hold Black Holes on Collision Course 2015-09-22T04:00:00Z The black-hole feeding rampage that follows generates the geysers of radiation that we here on Earth identify as quasars. Why Colliding Galaxies Never Go out of Style 2015-10-15T04:00:00Z At even greater distances, where many ordinary galaxies are too dim to see, we find quasars. Astronomy 2016-10-13T00:00:00Z The violent origin of quasars: Hubble shows that quasars get their fuel when their host galaxies collide. Physics Week in Review: July 4, 2015 2015-07-04T04:00:00Z We already know that quasars flicker, varying in brightness by a factor of up to three, Krolik says. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z Astronomers believe this is what produces the energies of quasars, brilliant beacons in the cores of galaxies that far outshine the starry cities in which they dwell. Black Hole Hunters 2015-06-08T04:00:00Z Finding two quasars within even a few million light years of each other was a rarity, with no instances of three in one place found at all. A Newfound Cluster Of Quasars Challenges Our Most Cosmic Of Expectations 2015-05-18T04:00:00Z The enormous energy of the quasars is produced by gas that is heated to a temperature of millions of degrees as it falls toward a massive black hole and swirls around it. Astronomy 2016-10-13T00:00:00Z The quasars are in the middle of a particularly crowded part of the early universe, with a greater than average number of galaxies. Astronomers spot one-in-10-million phenomenon in early universe 2015-05-14T04:00:00Z Astronomers peering across the universe think they’ve caught a dozen quasars—extremely bright and distant objects powered by ravenous supermassive black holes at the centers of ancient galaxies—in a disappearing act. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z So his eyes turned to the heavens and the mysteries of quasars. Black Hole Hunters 2015-06-08T04:00:00Z In fact, based on our understanding of quasars, there shouldn’t be enough cool, dense gas to power more than two of them in any single, dense region of the Universe. A Newfound Cluster Of Quasars Challenges Our Most Cosmic Of Expectations 2015-05-18T04:00:00Z The brilliance of quasars makes them the most distant beacons we can see in the dark oceans of space. Astronomy 2016-10-13T00:00:00Z One should note here Bartusiak’s use of the word “appears,” for although there is now a vast amount of indirect evidence for black holes — including quasars and pulsars — we still lack direct evidence. The centuries-old battle over the question of black holes 2015-05-08T04:00:00Z Instead, Merloni proposed, a single star passed near a supermassive black hole and was rapidly torn apart, causing a bright flare that astronomers mistook for a quasar. The Case of the Disappearing Quasars 2015-11-23T05:00:00Z Dr. Doeleman traced his interest in quasars and black holes to the moment he first saw images like that. Black Hole Hunters 2015-06-08T04:00:00Z So imagine the shock rippling throughout the astronomical community when the discovery of an ultra-rare, quadruple quasar in a single nebula was announced. A Newfound Cluster Of Quasars Challenges Our Most Cosmic Of Expectations 2015-05-18T04:00:00Z With quasars we can see way back close to the Big Bang explosion that marks the beginning of time. Astronomy 2016-10-13T00:00:00Z As Jeletic gave his tour at Goddard, the Hubble was pointed at a quasar — an extremely bright source of light at the core of a distant galaxy with a black hole at the center. Still sharp, Hubble Space Telescope turns 25 with a cloudy future 2015-04-21T04:00:00Z LaMassa’s talk in January created enough of a controversy that three additional teams conducted their own research, searching for further examples of these so-called “changing-look quasars.” The Case of the Disappearing Quasars 2015-11-23T05:00:00Z But Dr. Doeleman is also excited about what he likes to call the “secret sauce” of the Event Horizon Telescope: the chance to see inside the engine that produces the monstrous energies of quasars. Black Hole Hunters 2015-06-08T04:00:00Z The observatory is home to the Lovell Telescope, which was the largest steerable radio dish in the world when it was built in 1955 and was instrumental in the discovery of quasars. UK and Italy wrestle over mega-telescope's hub 2015-03-05T05:00:00Z Beyond the quasars and the most distant visible galaxies, we have detected the feeble glow of the explosion itself, filling the universe and thus coming to us from all directions in space. Astronomy 2016-10-13T00:00:00Z But the scientists aren’t put off by the mystery of the quasar, it’s exactly the sort of thing they were looking for. Impossibly Huge Black Hole Is More Massive Than 12 Billion Suns 2015-02-26T05:00:00Z Not only is the black hole the biggest ever seen but also it’s at the center of the largest quasar ever discovered. Scientists Find New Supermassive Black Hole 2015-02-26T05:00:00Z But for now, Wu said, his team is using the brilliant quasar as a beacon to find other space objects. Astronomers find a shockingly ancient black hole the size of 12 billion suns 2015-02-25T05:00:00Z Researchers from Peking University and the University of Arizona discovered what is being called a “monster black hole,” which is powering the brightest quasar yet found. Scientists discover theory-defying black hole 12 billion times the size of the Sun 2015-02-25T05:00:00Z Measurements of the properties of galaxies and quasars in remote locations require large telescopes, sophisticated light-amplifying devices, and painstaking labor. Astronomy 2016-10-13T00:00:00Z “This ultraluminous quasar with its supermassive black hole provides a unique laboratory to the study of the mass assembly and galaxy formation around the most massive black holes in the early universe,” said Fan. Impossibly Huge Black Hole Is More Massive Than 12 Billion Suns 2015-02-26T05:00:00Z Ancient quasars may provide information about how stars formed in the early universe. Astronomers find giant black hole in early universe 2015-02-25T05:00:00Z Dr Jones and his colleagues tracked Cassini's position relative to a reference grid of quasars - bright, ancient radio wave sources well beyond our galaxy. Saturn pinpointed to within one mile 2015-01-09T05:00:00Z The quasar and black hole at its center are 12.8 billion light-years from Earth. Scientists discover theory-defying black hole 12 billion times the size of the Sun 2015-02-25T05:00:00Z The physical processes around the jovian planets turn out to be milder versions of what astronomers find in many distant objects, from the remnants of dead stars to the puzzling distant powerhouses we call quasars. Astronomy 2016-10-13T00:00:00Z This was the era before an important cosmic event astronomers call the epoch of reionisation or the cosmic dawn, when light from the first galaxies and quasars appeared in the Universe. Impossibly Huge Black Hole Is More Massive Than 12 Billion Suns 2015-02-26T05:00:00Z The merging black holes manifested as a regular flicker in a quasar — a mass of light and energy — in a remote galaxy known as PG 1302-102. In a Far-Off Galaxy, 2 Black Holes Dance Toward an Explosive Union 2015-01-07T05:00:00Z The latest CMB data from Planck are now converging on the quasar value, says Mandolesi. European probe shoots down dark-matter claims 2014-12-01T05:00:00Z And there just aren’t enough quasars to account for the glow detected by the Hubble space telescope’s cosmic origins spectrograph. An Intergalactic Light That Shines Too Bright 2014-07-11T04:00:00Z The most powerful quasars are seen only at early times. Astronomy 2016-10-13T00:00:00Z It is quasars that limit the growth of black holes, which is one of the reasons why this ultraluminous quasar around this gigantic black hole is so puzzling. Impossibly Huge Black Hole Is More Massive Than 12 Billion Suns 2015-02-26T05:00:00Z The quasar dates back to less than one billion years after the big bang. A Cosmic Test For 'Spooky' Entanglement 2014-06-18T04:00:00Z The second measure involves using the light from those quasars to pinpoint the positions of clouds of hydrogen gas along the line of sight to Earth. Cosmos speed-check for dark energy 2014-04-07T18:05:01Z The grounding of relativity in the real world through the discoveries of quasars, pulsars, neutron stars and black holes makes the paramount significance of experimental evidence in lending respectability to a theory quite clear. “The Perfect Theory”: The story of general relativity, and what makes something a science 2014-02-05T20:15:35Z You might say that the quasars were more active when their black holes had fuel for their “energy-producing engines.” Astronomy 2016-10-13T00:00:00Z Using this measure, scientists are able to date quasars and they’ve put this one in the early cosmic dawn, just 900 million years after the Big Bang. Impossibly Huge Black Hole Is More Massive Than 12 Billion Suns 2015-02-26T05:00:00Z The dust is also hiding the view of the underlying galaxy of stars that the quasar is presumably embedded in. A Cosmic Test For 'Spooky' Entanglement 2014-06-18T04:00:00Z One is to map the distribution of quasars, which are extremely luminous, distant galaxies. Cosmos speed-check for dark energy 2014-04-07T18:05:01Z At the Keck Observatory, the Cosmic Web Imager, scheduled for installation next year, will examine clouds in finer detail around quasars that lie closer to Earth. Light from Ancient Quasar Reveals Intergalactic Web 2014-01-23T19:00:00Z A number of galaxies closer to us also show strong activity at their centers—activity now known to be caused by the same mechanism as the quasars. Astronomy 2016-10-13T00:00:00Z The quasar illuminates a nearby gas cloud measuring two million light-years across. Cosmic 'web' seen for first time 2014-01-20T14:05:50Z Our “Cosmic Bell” setup, says Friedman, would replace these number generators with real-time observations of quasars, using existing Canary Islands telescopes. A Cosmic Test For 'Spooky' Entanglement 2014-06-18T04:00:00Z The system uses food scraps from the concessions – an estimated 35 tons per season — which is ground into a slurry and transported to the quasar energy group at Ohio State University. More Professional Sports Teams Are Thinking Green, To Please Fans And Make Money 2014-01-15T22:52:00Z The team used a brilliant quasar, seen as it appeared when the Universe was less than 3 billion years old, to illuminate the faint gas in the beacon’s neighborhood. Light from Ancient Quasar Reveals Intergalactic Web 2014-01-23T19:00:00Z Both active galactic nuclei and quasars derive their energy from material falling toward, and forming a hot accretion disk around, a massive black hole. Astronomy 2016-10-13T00:00:00Z "But the typical bread-and-butter quasars are actually where most of the black-hole growth is happening. They are the norm, and they don't need the drama of a collision to shine." Quasars on a diet 2012-07-27T06:40:00Z It’s a reminder that even from our own backyards, in a very real sense, we are just as connected to the grand sweep of sky and space and time as if circling a distant quasar. A Cosmic Test For 'Spooky' Entanglement 2014-06-18T04:00:00Z Credit: Wikipedia Even with our grand sweep of sky, we still forget that from our own backyards, we are just as connected to space and time as if circling a distant quasar. Life In An Alternate Universe 2013-11-29T23:25:00Z Even if it is just a mammoth gas cloud, the discovery is significant, Schaye notes, because it seems that only some galaxies and quasars are surrounded by such clouds. Light from Ancient Quasar Reveals Intergalactic Web 2014-01-23T19:00:00Z Two light rays from a distant quasar are shown being bent while passing a foreground galaxy; they then arrive together at Earth. Astronomy 2016-10-13T00:00:00Z Ancient Black Hole Has Extra Suck: rare class of quasars appear to be sucking in material at relativistic speeds. Physics Week in Review: November 9, 2013 2013-11-09T20:45:03.370Z This artist’s impression of one of the most distant, oldest, brightest quasars ever seen is hidden behind dust. A Cosmic Test For 'Spooky' Entanglement 2014-06-18T04:00:00Z The ensemble of black hole and gas would form a free-floating quasar: a brilliant engine of radiation driven by superheated gas spiraling around a massive black hole. Are Galaxies Playing Catch with Black Holes? 2013-07-18T20:45:00.637Z One reason I’m in this field of astronomy — planetary astronomy — is that I like to visualize things, but it’s hard for me to picture a cosmological object like a quasar in my mind. Neptune s New Moon May Be Named after One of Sea God s Monstrous Children 2013-07-18T14:45:00.703Z We also saw in Active Galaxies, Quasars, and Supermassive Black Holes that many quasars are found in the centers of elliptical galaxies. Astronomy 2016-10-13T00:00:00Z Among the outstanding questions: just what kinds of particles are in quasar jets? Quasars at 50: Luminous Cosmic Beacons Remain a Puzzle 2013-03-14T17:15:16.930Z Advanced and renewable energy projects like those championed by quasar and LEEDCo will continue to create jobs as they leverage natural resources and industrial supply chain capabilities already available. The Smart Business of Advanced Energy 2013-02-01T19:16:32Z Bringing the comparison to our cosmic neighborhood, the new record-holding group of quasars spans about 1600 times the distance between our Milky Way galaxy and our neighbor Andromeda. ScienceShot: The Largest Structure in the Universe 2013-01-11T19:20:00Z Of course, like a lot of spoiled diners, I tend not to regret, or sometimes even notice, the disappearance of restaurants that were quasars of buzz and hype just a handful of years earlier. Why 2012 Was A Terrible Year For Restaurants 2013-01-10T12:30:05Z The development of massive black holes then triggered quasars and other active galactic nuclei whose powerful outflows of energy and matter shut off the star formation in their host galaxies. Astronomy 2016-10-13T00:00:00Z “I see fewer and fewer serious theory papers on AGNs, but there is a burgeoning effort to find ever more quasars in surveys,” he writes. Quasars at 50: Luminous Cosmic Beacons Remain a Puzzle 2013-03-14T17:15:16.930Z Most quasars are millions or even billions of light-years distant, which means we see them as they were long ago. Biggest Black Hole Blast Ever Could Solve Cosmological Mystery 2012-11-28T16:45:00.503Z According to that theory, the researchers say, the universe's large-scale structures—in this case, clumps of objects such as quasars—shouldn't be larger than 1.2 billion light-years across. ScienceShot: The Largest Structure in the Universe 2013-01-11T19:20:00Z In these skewers of light astronomers see markers, or absorption lines, from when the light passed through an intervening hydrogen gas cloud on its way from the quasar. How a new map of the early universe is like a hedgehog 2012-11-14T04:15:00.187Z What are the advantages and disadvantages of using quasars to probe the early history of the universe? Astronomy 2016-10-13T00:00:00Z “Have we made good progress in understanding quasars in five decades?” Quasars at 50: Luminous Cosmic Beacons Remain a Puzzle 2013-03-14T17:15:16.930Z Arav said he wants to do more observations and see if he and his colleagues can't find more quasars like this one. Biggest Black Hole Blast Ever Could Solve Cosmological Mystery 2012-11-28T16:45:00.503Z Light from these quasars started its journey when the universe was only 5 billion years old, the researchers say. ScienceShot: The Largest Structure in the Universe 2013-01-11T19:20:00Z The method relies on bright but distant objects known as quasars to map the spread of hydrogen gas clouds in space. Dark energy's roller coaster ride 2012-11-13T08:29:47Z Parallaxes of stars are sometimes measured relative to the positions of galaxies or distant objects called quasars. Astronomy 2016-10-13T00:00:00Z The general picture of quasars is now relatively uncontroversial—giant black holes at the centers of distant galaxies feed on gas and even nearby stars, glowing brightly across the electromagnetic spectrum as a result. Quasars at 50: Luminous Cosmic Beacons Remain a Puzzle 2013-03-14T17:15:16.930Z "Our simulations showed that if we allowed the quasar to release a lot of mechanical energy, then the masses of galaxies would match observations," Arav said. Biggest Black Hole Blast Ever Could Solve Cosmological Mystery 2012-11-28T16:45:00.503Z The team, from the third Sloan Digital Sky Survey, expect to expand the survey with light from about 160,000 quasars by the end of the project. First map produced of universe 11 billion years ago 2012-11-13T00:04:51Z As the quasars' light travels through space towards Earth, it passes through clouds of hydrogen gas. Dark energy's roller coaster ride 2012-11-13T08:29:47Z Note that nothing in this image distinguishes the quasar from an ordinary star. Astronomy 2016-10-13T00:00:00Z Lemonick goes on to write: When my father first told me about the cosmos, astronomers didn’t know about quasars, or black holes, or pulsars. Never Mind Life on Distant Planets. What About Distant Moons? 2012-10-15T13:35:39Z Some galaxies containing active black holes, called quasars, shine more brightly than anything else in the universe. Biggest Black Hole Blast Ever Could Solve Cosmological Mystery 2012-11-28T16:45:00.503Z The agenda includes a census of galaxies within 2 billion light-years of Earth, studies of cosmic magnetic fields, searches for black holes, and looks at pulsars and quasars. Australia Completes Powerful New Radio Telescope 2012-10-05T17:55:59Z The goal in the next few years is to map the locations of a million-and-a-half galaxies and more than 160,000 quasars. Dark energy's roller coaster ride 2012-11-13T08:29:47Z Over a million quasars have now been discovered, and spectra are available for over a hundred thousand. Astronomy 2016-10-13T00:00:00Z A vast satellite dish scans the heavens for signs of those bizarre deep space phenomena known as quasars - the huge structure twitching and turning around the clock. So remote, it could pass for Mars 2012-09-06T08:22:38Z It extended our understanding of stellar objects, such as quasars, and provided a valuable insight into the origins of the universe itself. Obituary: Sir Bernard Lovell 2012-08-07T13:24:46Z Along with faint galaxies and quasars — the luminous cores of young galaxies with supermassive black holes at their centres — the objects that emit GRBs are among the most distant in the cosmos. Messages from the early Universe 2012-05-16T17:50:22.410Z Fang digs up an article he wrote on the distribution of redshifts of quasars. When Science and Politics Mix: Fang Lizhi (1936 2012) 2012-04-09T23:45:03.803Z One of these two bright “stars” in the middle is in our Galaxy, while the other is a quasar 9 billion light-years away. Astronomy 2016-10-13T00:00:00Z This should allow users to calculate distances to some of the Universe's most remote objects, such as quasars, the luminous cores of distant galaxies containing giant . Gemini Observatory's Twin Telescopes Reboot 2012-01-18T22:15:15.957Z This should allow users to calculate distances to some of the Universe’s most remote objects, such as quasars, the luminous cores of distant galaxies containing giant black holes. Gemini?s twin telescopes reboot 2012-01-18T18:20:27.393Z That gas absorbs the quasar light at particular frequencies, imprinting a bar code of narrow lines onto the quasar spectrum. Inconstant Constants 2011-12-31T05:15:18.567Z More distant objects have been spotted in recent years, such as a gamma ray burst and a galaxy more than 13 billion light-years away, but this quasar is hundreds of times more luminous. The Year in Pictures 2011-12-22T19:11:37Z At what fraction of the speed of light is the quasar moving away? Astronomy 2016-10-13T00:00:00Z Nowadays, everyone pretty much agrees that quasars are supermassive black holes at the cores of young galaxies. The Blackest Black Hole: Scientists Find a Monster the Size of 21 Billion Suns 2011-12-09T09:00:00Z In research released Monday by the journal Nature, the scientists suggest these black holes may be the leftovers of quasars that crammed the early universe. Scientists find monster black holes, biggest ones yet 10 billion times size of our sun 2011-12-05T20:08:50Z We needed some high-precision laboratory measurements against which to compare the quasar spectra, so we persuaded experimenters to undertake them. Inconstant Constants 2011-12-31T05:15:18.567Z Astronomers say it is the most distant quasar, a massive black hole surrounded by luminous gas, that they have ever seen as well as the brightest object to be sighted in the early universe. The Year in Pictures 2011-12-22T19:11:37Z Observations with the Hubble Space Telescope provided the strongest evidence showing that quasars are located at the centers of galaxies. Astronomy 2016-10-13T00:00:00Z In the early days of the universe, quasars, thought to be powered by giant black holes in cataclysmic feeding frenzies, were fountaining energy into space. Astronomers Find Biggest Black Holes Yet 2011-12-05T15:54:01Z That in turn enabled them to learn more about the properties of the matter in the quasar as it moves ever closer towards the event horizon of the black hole. Hubble Telescope Observes Matter Falling Into Black Hole 2011-11-06T00:29:19Z The first one we looked for was a distortion of the wavelength scale against which the quasar spectral lines were measured. Inconstant Constants 2011-12-31T05:15:18.567Z The quasar's brilliance is powered by a monstrous black hole at its center that's 2 billion times more massive than the sun. The Year in Pictures 2011-12-22T19:11:37Z The reason is that quasars can outshine their entire galaxies by factors of 10 to 100 or even more. Astronomy 2016-10-13T00:00:00Z Back then, the team looked at the brightly shining centers of ancient galaxies known as quasars. Fundamental Constant May Depend on Where in the Universe You Are 2011-11-04T20:30:59Z This involves taking advantage of distant, but cloesr, galaxies that lie between Earth and the quasar. Hubble Telescope Observes Matter Falling Into Black Hole 2011-11-06T00:29:19Z Line Editing Astronomy first entered the constants story soon after the discovery of quasars in 1965. Inconstant Constants 2011-12-31T05:15:18.567Z Their colleagues might be happy probing to the edge of the cosmos looking for exotic things like black holes and quasars and dark matter. Have Planet Hunters Discovered a Habitable World? 2011-09-14T09:00:00Z Quasars have been found in the cores of both spiral and elliptical galaxies, and each quasar has the same redshift as its host galaxy. Astronomy 2016-10-13T00:00:00Z An artist's impression of a quasar, the glowing heart of an ancient galaxy. Fundamental Constant May Depend on Where in the Universe You Are 2011-11-04T20:30:59Z Using this technique, researchers were able to directly determine the temperatures at different parts of the quasar, and determine measurements of its size. Hubble Telescope Observes Matter Falling Into Black Hole 2011-11-06T00:29:19Z They compared the spacing between these lines in quasar spectra with laboratory measurements. Inconstant Constants 2011-12-31T05:15:18.567Z "Technically, this object is what we call a quasar," explained Dr Daniel Mortlock, the lead author of the Nature paper from Imperial College London. 'Monster' drives cosmic beacon 2011-06-30T10:12:53Z The top left image shows a quasar that lies at the heart of a spiral galaxy 1.4 billion light-years from Earth. Astronomy 2016-10-13T00:00:00Z Light from the quasars must pass through clouds of gas on its several-billion-year journey to Earth, and the atoms in the gas absorb light of specific wavelengths. Fundamental Constant May Depend on Where in the Universe You Are 2011-11-04T20:30:59Z The scientists were able to observe the quasars using a technique called gravitational lensing. Hubble Telescope Observes Matter Falling Into Black Hole 2011-11-06T00:29:19Z Such a distortion might conceivably be introduced, for example, during the processing of the quasar data from their raw form at the telescope into a calibrated spectrum. Inconstant Constants 2011-12-31T05:15:18.567Z What is a puzzle is the scale of the black hole driving this quasar. 'Monster' drives cosmic beacon 2011-06-30T10:12:53Z The bottom left image shows a quasar that lies at the center of an elliptical galaxy some 1.5 billion light-years from us. Astronomy 2016-10-13T00:00:00Z But while quasars are pretty common nowadays, the newest one, reported in the latest issue of , is still a big deal. Ancient quasar can give clues to the dawn of the universe 2011-06-30T09:20:00Z A quasar accretion disc is the glowing matter slowly spiraling into a supermassive black hole at the center of a galaxy. Hubble Telescope Observes Matter Falling Into Black Hole 2011-11-06T00:29:19Z To test for problems of this kind, we substituted calibration data for the quasar data and analyzed them, pretending they were quasar data. Inconstant Constants 2011-12-31T05:15:18.567Z But the quasar is hundreds of times brighter than the GRB, and certainly bright enough to allow scientists to start to probe the object and its surroundings in some detail. 'Monster' drives cosmic beacon 2011-06-30T10:12:53Z The middle images show remote pairs of interacting galaxies, one of which harbors a quasar. Astronomy 2016-10-13T00:00:00Z This new quasar, though, appears to date from a time when the clearing process wasn't yet complete. Ancient quasar can give clues to the dawn of the universe 2011-06-30T09:20:00Z The ancient quasar was spotted in the Infrared Deep Sky Survey at the U.K. Brilliant, but Distant: Most Far-Flung Known Quasar Offers Glimpse into Early Universe 2011-06-29T19:45:05.217Z |
| 随便看 |
|
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。