| 单词 | radial velocity |
| 例句 | The Doppler effect lets astronomers measure the star’s radial velocity: that is, the speed of the star, toward us or away from us, relative to the observer. Astronomy 2016-10-13T00:00:00Z This “radial velocity” technique has already been used to detect dozens of exoplanets with hundreds more awaiting confirmation. A way to find ‘quiet’ black holes finally bears fruit 2022-07-17T04:00:00Z Researchers made this estimation using the aforementioned radial velocity technique. Astronomers discover a tiny planet orbiting our nearest galactic neighbor 2022-02-14T05:00:00Z “We are continuing to monitor the star with precise radial velocity measurements, so stay tuned.” Exoplanet slightly larger than Neptune found close to Earth 2020-06-25T04:00:00Z The "radial velocity technique" is a discovery method used by researchers to identify new worlds by tracking how their parent stars "wobble" in response to gravitational tugs from those planets. Scientists discover a 2020-01-17T05:00:00Z Measurements of the variation in the star’s radial velocity as the planet goes around the star can tell us the mass and orbital period of the planet. Astronomy 2016-10-13T00:00:00Z He says all the proposed black hole radial velocity sightings of recent years now have papers casting doubt on them, debunked by his team or others. A way to find ‘quiet’ black holes finally bears fruit 2022-07-17T04:00:00Z To confirm the planets' existence, the team used the "radial velocity" method, which looks for the wobbles in a star's movement induced by the gravitational tugs of accompanying worlds. Newfound "Ablating" Exoplanets Could Reveal Alien Geology 2019-12-23T05:00:00Z While measuring the radial velocity of galaxies, she observed velocities incompatible with those predicted by the laws of gravity. How Mere Humans Manage to Comprehend the Vastness of the Universe 2019-10-11T04:00:00Z To find HR 5183 b, researchers at the California Planet Search used the radial velocity method—a common planet-seeking technique that observes how a star “wobbles” because of the gravitational tug of an orbiting planet. Test Pilot Geese, Planetary Wrecking Balls and Super AI Vision: The Week’s Best Science GIFs 2019-09-06T04:00:00Z Today, radial velocity can be measured for any star bright enough for its spectrum to be observed. Astronomy 2016-10-13T00:00:00Z Researchers discovered the exoplanet using the radial velocity method, a discovery method that identifies new worlds by tracking how their parent stars “wobble” in response to gravitational tugs from those planets. A bizarre exoplanet is making astronomers rethink how solar systems form 2019-08-29T04:00:00Z Blunt and her colleagues found the planet using the radial velocity method, which looks for the gravitational tugs a world exerts on its host star. Newfound Alien Planet Has a Bizarre Looping Orbit 2019-08-28T04:00:00Z All hope is not lost, though, because it remains possible to dismiss the exomoon hypothesis using a method called radial velocity. An Exomoon Eludes Astronomers—for Now 2019-05-03T04:00:00Z The research pushed the limits of the radial velocity detection technique, which becomes more difficult the farther a planet is from its star. Signs of a ‘super Earth’ discovered around a nearby star 2018-11-14T05:00:00Z As we will see in The Stars: A Celestial Census, radial velocity measurements of double stars are crucial in deriving stellar masses. Astronomy 2016-10-13T00:00:00Z The researchers used the radial velocity method to detect the new planet. Planet found circling neighbouring star 2018-11-14T05:00:00Z Each measurement tracks the radial velocity of Barnard’s Star—its motion toward or away from Earth, which can wobble back and forth in sync with the orbital tugging of accompanying planets. A Frozen Super-Earth May Orbit Barnard's Star 2018-11-14T05:00:00Z After the radial velocity begins to plummet, the second key moment happens, when the star reaches its closest approach to the black hole as seen in “flat” images. Star swings around black hole, tests gravity 2018-07-29T04:00:00Z But its low mass makes it ideal for analysis using the radial velocity technique of exoplanet detection, which exploits the way a planet’s gravitational pull makes a star wobble as it orbits around it. Signs of a ‘super Earth’ discovered around a nearby star 2018-11-14T05:00:00Z The Doppler effect is then used to measure radial velocities of the orbiting material and so derive the speed with which it moves around. Astronomy 2016-10-13T00:00:00Z The new release offers measurements of that sideways motion for all 1.3 billion stars, plus radial velocities for 7 million of the brightest ones. One of the Milky Way’s fastest stars is an invader from another galaxy 2018-05-08T04:00:00Z And what Gaia also sees is the stars' movement along its line of sight - their so-called "radial velocity", their true motion on the sky. 'Book of the heavens' takes shape 2018-04-25T04:00:00Z But she really wants to see what happens at the final turn in the radial velocity before assessing what her own data are telling her. Star swings around black hole, tests gravity 2018-07-29T04:00:00Z Plus, the Gaia data includes information about how fast some stars are moving toward us or away from us, in what is known as radial velocity. New galactic map shows the positions and brightness of 1.7 billion stars 2018-04-25T04:00:00Z Which of the following can you determine about a star without knowing its distance, and which can you not determine: radial velocity, temperature, apparent brightness, or luminosity? Astronomy 2016-10-13T00:00:00Z Then they checked these candidates with ground-based telescopes in California, the Canary Islands, and South Africa to classify their stellar types and get their missing radial velocities. One of the Milky Way’s fastest stars is an invader from another galaxy 2018-05-08T04:00:00Z The data also include the radial velocities—the motions toward or away from Earth—of seven million stars. Stellar Effort: Chart of Milky Way Includes More Than One Billion Stars 2018-04-24T04:00:00Z Among them were exoplanets that were detected by ground-based telescopes that looked for the periodic wobble in a star’s motion caused by a planet’s tiny tug — a technique known as the radial velocity method. NASA steps up its planet-hunting game with the launch of TESS 2018-04-20T04:00:00Z In the early years of exoplanet science, this “radial velocity” method was the technique of choice, because dim planets are too faint to see so close to the glare of their stars. Mountaintop planet hunter turns on 2017-12-06T05:00:00Z If spectral line wavelengths are changing for objects based on the radial velocities of those objects, how can we deduce which type of atom is responsible for a particular absorption or emission line? Astronomy 2016-10-13T00:00:00Z Light or its absence is also the root of something called the transit technique, a newer, more efficient way than radial velocity of finding exoplanets by looking at their stars. ‘The World Sees Me as the One Who Will Find Another Earth’ 2016-12-07T05:00:00Z The longer the mission runs, they believe, the closer Gaia will get to its target of 150 million radial velocity measurements - and that movie. Gaia space telescope plots a billion stars - BBC News 2016-09-14T04:00:00Z They actually found this planet using another technique called the radial velocity method. Exoplanet Proxima b is 'potentially habitable' — so how would we find life if it's there? 2016-08-25T04:00:00Z In today’s radial velocity measurements, researchers are fighting against the natural noise in stellar light caused by a star’s turbulent atmosphere. Mountaintop planet hunter turns on 2017-12-06T05:00:00Z A plot showing how the velocities of the stars change with time is called a radial velocity curve; the curve for the binary system in Figure 18.6 is shown in Figure 18.7. Astronomy 2016-10-13T00:00:00Z By using a complex mathematical method called radial velocity, they witnessed the planet’s gravitational effect on its star and deduced that it must be there. ‘The World Sees Me as the One Who Will Find Another Earth’ 2016-12-07T05:00:00Z One eagerly anticipated measurement is the radial velocity of stars. Gaia space telescope plots a billion stars - BBC News 2016-09-14T04:00:00Z The radial velocity measurements confirmed that the star system was actually speeding away from us. Alien star invaded the Solar System 2015-02-18T05:00:00Z Both reveal orbits, but radial velocity points to a planet’s mass, while transits reveal its size. Mountaintop planet hunter turns on 2017-12-06T05:00:00Z If there is a massive planet in orbit around the star, the gravity of the planet causes the star to wobble, changing its radial velocity by a small but detectable amount. Astronomy 2016-10-13T00:00:00Z Precise measurements of the radial velocity of the star 51 Pegasi showed minuscule repeated changes caused by a planet's gravitational pull. Astronomy: Planets in chaos 2014-07-01T04:00:00Z In exoplanet detection, radial velocity surveys look for a periodic wobble in a target star’s spectral lines, caused by the telltale gravitational influence of a planetary body orbiting its parent star. On The Hunt For The Very Closest Alien Earths 2014-01-18T10:19:00Z Marcy and his colleagues, for example, used radial velocity measurements, observing the Doppler shift in starlight as stars are tugged by the gravity of orbiting planets. ‘Super-Earths’ and ‘mini-Neptunes’ abound among planets outside our solar system 2014-01-06T23:17:00Z One such method is the radial velocity technique, which measures the wobble in a host star's light induced by the gravitational pull of an orbiting planet. Lava Planet is Most Earthlike Alien Planet Yet 2013-10-30T19:45:00.417Z The gray dots indicate planets discovered by measuring the radial velocity of the star, and the red dots are for planets that transit their stars. Astronomy 2016-10-13T00:00:00Z The planets van de Kamp had described would exert a considerable tug on Barnard’s Star, generating a wavelike oscillation in the radial velocity data. 50 Years Ago, an Astronomer Discovered the First Unambiguous Exoplanet (or So He Thought) 2013-05-30T15:45:00.193Z It is increasingly clear that in existing data from radial velocity measurements there may be evidence of many more planets. Nearest Sun-like star has planets 2012-12-19T05:32:06Z Udry and his colleagues found the putative planet by tracking Doppler shifts in the starlight from Alpha Centauri B—the so-called radial velocity method of planet searching. The Exoplanet Next-Door: Astronomers Discover World in Nearest Star System 2012-10-17T14:15:00.470Z This so-called radial velocity variation is what astronomers often measure to find exoplanets. Fact Finder: Wobble, Wobble 2012-08-18T15:15:05.187Z This pulsation is very slight, but it can be detected by measuring the radial velocity of the solar surface—the speed with which it moves toward or away from us. Astronomy 2016-10-13T00:00:00Z All those stars whose radial velocities have been studied have been found to be binaries whose period of orbital revolution coincides with that of their light change. Astronomical Curiosities Facts and Fallacies 2012-03-27T02:00:18Z From corresponding radial velocities, we draw the ready conclusion that certain groups or clusters of stars are actually connected in space and moving as related systems, as in the Pleiades and Ursa Major. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z "During different activity phases, what we have is that more and more spots will appear on your star, and that will perturb your radial velocities." The Exoplanet Next-Door: Astronomers Discover World in Nearest Star System 2012-10-17T14:15:00.470Z There is the radial velocity, or ‘wobble’ technique, which senses the motion of a star around a common center-of-mass with its planets. Gravitational Mesolensing And The Hunt For Exoplanets 2012-03-07T16:15:00.230Z We can see from this illustration that the Doppler effect is produced only by a motion toward or away from the observer, a motion called radial velocity. Astronomy 2016-10-13T00:00:00Z These gases “both propel the rocket forward and force the projectile to rotate at high radial velocity” – as high as 366 rotations per second. At War Blog: Mao's Rockets and the Eastern Afghan Border War, Part II. 2011-10-27T16:34:33Z Studies of radial velocities of the stars have hitherto been necessarily confined to the brighter stars, for the most part even to those visible to the naked eye. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z Typically, in these "transit" measurements, the dimmings merely suggest planets; their presence is confirmed by ground-based telescopes that look for the "wobble" - a method known as radial velocity measurements. Exoplanet sextet stuns stargazers 2011-02-02T18:00:11Z The MEarth team also used radial velocity data from a larger telescope to detect the planet's gravitational pull on its host star, which yielded a mass estimate. Worlds Away: Astronomers Begin to Uncover Nearby "Super-Earths" 2011-01-05T22:15:14.577Z Since the speed of light is a universal constant, we can then calculate the radial velocity of the star. Astronomy 2016-10-13T00:00:00Z The researchers use an indirect method radial velocity to detect planets. Just-right planet that can support life detected 2010-09-29T23:00:00Z Practically all are gaseous in composition, and have large radial velocities. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z The most common is the radial velocity method, in which astronomers study the slight Doppler shift in starlight as the star is tugged to and fro by an orbiting planet. 2010-01-12T05:00:00Z Not only the grosser facts concerning radial velocity, but variations in it so small as a mile, or less, per second, have been recorded and interpreted in terms of deep meaning. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" These curves plot the radial velocities of two stars in a spectroscopic binary system, showing how the stars alternately approach and recede from Earth. Astronomy 2016-10-13T00:00:00Z It not only gave him a picture of the body of the slowly spinning mountain, but the distance and the angular and radial velocities. Thin Edge But radial velocity determinations afford the ultimate and most satisfactory test, and Campbell has this investigation in hand, classifying the stars in their streaming according to the type. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z Another told him his radial velocity relative to it. Anchorite He employed in his discussion the radial velocities of 280 stars, spectroscopically Astrophysics. determined; and the upshot signally exemplified the community of interests between the rising science of astrophysics and the ancient science of astrometry. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" This shift is known as the Doppler effect and can be used to measure the radial velocities of distant objects. Astronomy 2016-10-13T00:00:00Z The eminent director of this observatory, W. W. Campbell, has in a high degree developed the accuracy in the determination of radial velocities and has moreover carried out such determinations in a large scale. Lectures on Stellar Statistics But the results of spectroscopic measurements of radial velocity are independent of the distance of the star. Side-Lights on Astronomy and Kindred Fields of Popular Science There are some kinds of nebulae for which very large values of the radial velocities have been found. Lectures on Stellar Statistics The following table contains all stars with a radial velocity greater than 20 sir./st. Lectures on Stellar Statistics Such motion, along the line of sight between the star and the observer, is called radial velocity and is usually measured in kilometers per second. Astronomy 2016-10-13T00:00:00Z That the absolute velocity of these stars is, indeed, rather small may be found from column 10, giving their radial velocity, which in the mean amounts to only three siriometers per stellar year. Lectures on Stellar Statistics At the observatory of Lund, where as far as possible card catalogues of the attributes of the stars are collected, Gyllenberg has made a catalogue of this kind for the radial velocities. Lectures on Stellar Statistics From the discussion below of the radial velocities of the stars we shall find that this is a rather small figure. Lectures on Stellar Statistics We thus find in the radial velocities fresh evidence, independent of the distance, that these bright stars are giants among the stars in our stellar system. Lectures on Stellar Statistics The radial velocity is the component of the space velocity projected along the line of sight from the Sun to a star. Astronomy 2016-10-13T00:00:00Z According to the general law of statistical mechanics already mentioned small bodies upon an average have a great absolute velocity, as we have, indeed, already found from the observed radial velocities of these stars. Lectures on Stellar Statistics A large radial velocity seems therefore to be a galactic phenomenon and to be correlated to a great distance from us. Lectures on Stellar Statistics Generally we find from column 9 that these stars with large radial velocity possess also a large proper motion. Lectures on Stellar Statistics The radial velocity is, numerically, greater than could have been supposed. Lectures on Stellar Statistics Measurements of line shifts produced by the Doppler effect indicate the radial velocity of a star. Astronomy 2016-10-13T00:00:00Z |
| 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。