| 单词 | Hubble constant |
| 例句 | De Vaucouleurs was equally certain that the Hubble constant was 100.* A Short History of Nearly Everything 2003-05-06T00:00:00Z Sandage, after years of careful calculations, arrived at a value for the Hubble constant of 50, giving the universe an age of 20 billion years. A Short History of Nearly Everything 2003-05-06T00:00:00Z Ho has been known ever since as the Hubble constant and the whole as Hubble’s Law. A Short History of Nearly Everything 2003-05-06T00:00:00Z Almost the only thing constant about the Hubble constant has been the amount of disagreement over what value to give it. A Short History of Nearly Everything 2003-05-06T00:00:00Z A theory with just six parameters—including the Hubble constant—Lambda-CDM precisely fits the distribution of fluctuation sizes measured by Europe’s Planck spacecraft, says Tanvi Karwal, a cosmologist at the University of Chicago. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z The result is a Hubble constant closer to the background radiation method, but whether the kilonova method can resolve the Hubble trouble, the researchers do not yet dare to state: Colliding neutron stars provide a new way to measure the expansion of the Universe 2023-10-02T04:00:00Z To understand what cosmic expansion looks like right now, scientists can observe astronomical signals to measure the so-called Hubble constant. Will the Universe Ever Stop Expanding? 2023-08-29T04:00:00Z That has already been hinted at by the Hubble constant, a measure of how fast the universe seems to be expanding. Europe’s Euclid Space Telescope Is Launching a New Era in Studies of the ‘Dark Universe’ 2023-06-30T04:00:00Z Cast your gaze to the relatively nearby stars and galaxies that surround us in space, and you’ll arrive at a certain number for this value, known as the Hubble constant. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z However, the fit yields a value of the Hubble constant that clashes with the one measured directly. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z The number that describes the expansion goes by the name "the Hubble constant," appearing in multitude of different equations and models of the Universe and its constituents. Colliding neutron stars provide a new way to measure the expansion of the Universe 2023-10-02T04:00:00Z Freedman led a collaboration in the 1990s called the Hubble Space Telescope Key Project, which calculated the Hubble constant more precisely than anyone had before. Will the Universe Ever Stop Expanding? 2023-08-29T04:00:00Z The two parts of this problem give you some idea of how the Hubble constant for universal expansion and the time back to the Big Bang are determined, respectively. College Physics for AP Courses 2015-08-12T00:00:00Z Now a new measurement of the Hubble constant, made by observing a mirror image of a distant exploding star, or supernova, is complicating matters further. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z The Hubble constant, H0, is the rate at which the universe is expanding now. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z To understand the Universe we must therefore know the Hubble constant as precisely as possible. Colliding neutron stars provide a new way to measure the expansion of the Universe 2023-10-02T04:00:00Z If we then put this speed and the Hubble constant into Hubble’s law equation, we can solve for the distance. Astronomy 2016-10-13T00:00:00Z The Hubble constant is a central concept in cosmology. College Physics for AP Courses 2015-08-12T00:00:00Z In research published today in the journal Science, Patrick Kelly of the University of Minnesota and his colleagues used the time delay from a distant supernova known as Refsdal to measure the Hubble constant. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z Those theories boost the expansion rate before the CMB emerged, allowing the cosmos to evolve much as Lambda-CDM predicts while obtaining a higher Hubble constant now. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z Riess, for one, would like to see a resolution of the Hubble tension, which arises from differing estimates of the value of the Hubble constant, H0, the rate at which the universe is expanding. Astronomers Gear Up to Grapple with the High-Tension Cosmos 2022-04-18T04:00:00Z If the expansion is decelerating, then the Hubble constant should be decreasing over time. Astronomy 2016-10-13T00:00:00Z Together, the two networks could be used to measure the Hubble constant, which describes the expansion of the Universe, with much greater accuracy than ground-based detectors can, say researchers behind the mission. China Plans Asteroid Missions, Space Telescopes and a Moon Base 2022-02-24T05:00:00Z These tend to yield a higher value for the Hubble constant: around 73 km/s/Mpc. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z That observation spawned the idea of the big bang—and decades of bickering over the rate at which the universe is expanding, the Hubble constant. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z Measurements of the universe’s expansion rate, known as the Hubble constant, currently cluster around two figures: 67 and 73. The James Webb Space Telescope Could Solve One of Cosmology’s Deepest Mysteries 2022-01-25T05:00:00Z The unit used by astronomers for the Hubble constant is kilometers/second per million parsecs. Astronomy 2016-10-13T00:00:00Z At issue was the correct value of the Hubble constant, which has been called the most important number in the universe. Webb Telescope Prepares to Ascend, With an Eye Toward Our Origins 2021-12-20T05:00:00Z The Hubble constant can be measured in a number of ways. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z Besides revealing secrets of neutron stars, the study also produced a measurement of the Hubble constant, which reflects the expansion rate of the universe. Gravitational Waves Probe Exotic Matter inside Neutron Stars 2020-12-17T05:00:00Z It may just be an error resulting from the different ways the Hubble constant is being measured. The James Webb Space Telescope Could Solve One of Cosmology’s Deepest Mysteries 2022-01-25T05:00:00Z The “coasting” universe is one that expands at a constant rate given by the Hubble constant throughout all of cosmic time. Astronomy 2016-10-13T00:00:00Z And Dr. Freedman finds herself again in the middle, using a new space telescope to remeasure the Hubble constant. Webb Telescope Prepares to Ascend, With an Eye Toward Our Origins 2021-12-20T05:00:00Z “Measuring the Hubble constant locally is a way to directly test that model. If this shows there’s some fundamental piece of physics that’s missing from the standard model, that’s going to be very exciting.” Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z An online lecture by Wendy Freedman, professor of astronomy and astrophysics, University of Chicago, on the value of the Hubble constant. Skywatch: What’s happening in the heavens in November 2020-10-31T04:00:00Z Their calculations indicate that the Hubble constant is around 67. The James Webb Space Telescope Could Solve One of Cosmology’s Deepest Mysteries 2022-01-25T05:00:00Z Since the critical density goes as the square of the Hubble constant, by doubling the Hubble parameter, the critical density would increase by a factor a four. Astronomy 2016-10-13T00:00:00Z Cosmologists also use the variations to predict the rate at which the Universe is currently expanding, a measure known as the Hubble constant after the US astronomer Edwin Hubble. Mystery over Universe’s expansion deepens with fresh data 2020-07-14T04:00:00Z To find out for certain, more time-delayed supernovae will need to be studied, and their values of the Hubble constant will need to be ascertained. Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z Supernova distances are also at the heart of a dispute over the value of the expansion rate itself, known as the Hubble constant. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Here, it refers to measurements of the Hubble constant that hinge on calculating the distances to stars and galaxies, which may be “only” millions of light-years away. The James Webb Space Telescope Could Solve One of Cosmology’s Deepest Mysteries 2022-01-25T05:00:00Z Calculations also require the current value of the Hubble constant. Astronomy 2016-10-13T00:00:00Z The ACT data now vindicate Planck’s findings and produce a very similar value for the Hubble constant. Mystery over Universe’s expansion deepens with fresh data 2020-07-14T04:00:00Z “If they all favor a lower value of the Hubble constant, that would strengthen the disagreement. Hopefully we can figure out where the issue is.” Mirror-Image Supernova Yields Surprising Estimate of Cosmic Growth 2023-05-11T04:00:00Z Riess, who leads one of the teams estimating the Hubble constant using measurements of supernovae in the nearby universe, likens the sigma-eight tension to a “little brother or sister of the Hubble tension.” How Heavy is the Universe? Conflicting Answers Hint at New Physics 2020-05-12T04:00:00Z “Measuring distances is what you need to measure the Hubble constant because the Hubble constant is how distances change over time,” Treu says. The James Webb Space Telescope Could Solve One of Cosmology’s Deepest Mysteries 2022-01-25T05:00:00Z This technique works if, and only if, the Hubble constant has been truly constant throughout the entire life of the universe. Astronomy 2016-10-13T00:00:00Z This agreement between ACT and Planck on the Hubble constant is “a truly major milestone”, says Paul Steinhardt, a theoretical physicist at Princeton University. Mystery over Universe’s expansion deepens with fresh data 2020-07-14T04:00:00Z Also, there is still one of the original problems that Hubble was designed to help solve, which is determining how fast the universe is expanding—something called the Hubble constant. Space Telescope Director Says Best Is Yet to Come for Hubble 2020-04-27T04:00:00Z Those measures, in turn, reveal the rate of the expansion—the Hubble constant. How a Dispute over a Single Number Became a Cosmological Crisis 2020-02-18T05:00:00Z Using the Hubble Space Telescope to observe these red giants, Freedman’s team arrived at an estimate for the Hubble constant in 2019: roughly 70. The James Webb Space Telescope Could Solve One of Cosmology’s Deepest Mysteries 2022-01-25T05:00:00Z As we shall see in the chapter on The Big Bang, the accurate calculation of distances requires a model for how the Hubble constant has changed over time. Astronomy 2016-10-13T00:00:00Z But the tension on the Hubble constant remains. Mystery over Universe’s expansion deepens with fresh data 2020-07-14T04:00:00Z Right now there is a growing tension between measured values of the Hubble constant, between those based on the cosmic microwave background and those based on observing the relatively nearby universe using supernovae. Space Telescope Director Says Best Is Yet to Come for Hubble 2020-04-27T04:00:00Z The most recent result from SH0ES at that time showed a Hubble constant of 74 ± 2, and WMAP’s final result showed a Hubble constant of 70 ± 2. How a Dispute over a Single Number Became a Cosmological Crisis 2020-02-18T05:00:00Z But Suyu expects the VRO will find hundreds, enabling astronomers to study supernovae in detail and use them to calculate the Hubble constant, the expansion rate of the universe. Big telescopes join hunt for things that go flash in the night 2020-02-12T05:00:00Z This is just what Hubble and many astronomers after him needed to do in order to establish the Hubble law and the Hubble constant. Astronomy 2016-10-13T00:00:00Z Today, those using Planck and cosmic background data to obtain a value for the Hubble constant get a figure of 67.4 plus or minus 0.5. The Hubble constant: a mystery that keeps getting bigger 2019-11-02T04:00:00Z A result that promised to resolve a long-standing disagreement in the two most precise gauges of the Hubble constant — a measurement of the Universe’s rate of expansion — has spawned even more confusion. Daily briefing: The Universe is expanding — but how fast? 2019-07-17T04:00:00Z The quantum fluctuations in the CMB predict that the universe will mature with one value of the Hubble constant, whereas the general relativistic observations being made today are revealing another value. How a Dispute over a Single Number Became a Cosmological Crisis 2020-02-18T05:00:00Z Using standard theoretical assumptions about the cosmos, they calculated the Hubble constant as 67.8. How fast is the Universe expanding? Cosmologists just got more confused 2019-07-15T04:00:00Z For a Hubble constant of 20 kilometers/second per million light-years, the Hubble time is about 15 billion years. Astronomy 2016-10-13T00:00:00Z Hubble used this understanding in his work to calibrate cosmological distances, and Cepheids today continue to provide key calibration for astronomical distances for the local method for calculating the Hubble constant. The Hubble constant: a mystery that keeps getting bigger 2019-11-02T04:00:00Z In recent months, new measurements of the Hubble constant, the rate of universal expansion, suggested major differences between two independent methods of calculation. Cosmology Has Some Big Problems 2019-04-30T04:00:00Z One number, Sandage said, was the current rate of the expansion of the universe—the Hubble constant. How a Dispute over a Single Number Became a Cosmological Crisis 2020-02-18T05:00:00Z The hard part of measuring the Hubble constant is to reliably gauge galaxies’ distances. How fast is the Universe expanding? Cosmologists just got more confused 2019-07-15T04:00:00Z In these units, the Hubble constant is equal to about 70 kilometers/second per million parsecs, again with an uncertainty of about 5%. Astronomy 2016-10-13T00:00:00Z At issue is a number called the Hubble constant, a calculation for how fast the universe is expanding. New study says universe expanding faster and is younger 2019-04-26T04:00:00Z At issue is a number called the Hubble constant, named after Edwin Hubble, the Mount Wilson astronomer who in 1929 discovered that the universe is expanding. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z A value for Sandage’s first number—the Hubble constant—soon followed. How a Dispute over a Single Number Became a Cosmological Crisis 2020-02-18T05:00:00Z “Dust is very tricky to estimate and I am sure there will be lots of discussion” about why the authors’ approach leads to a lower estimate of the Hubble constant, he says. How fast is the Universe expanding? Cosmologists just got more confused 2019-07-15T04:00:00Z Estimates for the Hubble constant are actually closer to 21 or 22 kilometers/second per million light-years, which would make the age closer to 14 billion years. Astronomy 2016-10-13T00:00:00Z Cosmologists typically drop that mouthful at the end and simply say that the Hubble constant is between 67 and 68. Have We Mismeasured the Universe? 2019-02-06T05:00:00Z The Hubble constant simply says by how much. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z In 2001 the Hubble Space Telescope Key Project completed the first reliable measurement of the Hubble constant. How a Dispute over a Single Number Became a Cosmological Crisis 2020-02-18T05:00:00Z When they combine that information with its distance, they obtain a value for the Hubble constant. The Universe's Fate Rests on the Hubble Constant--Which Has So Far Eluded Astronomers 2019-01-30T05:00:00Z But there is still about a 5% uncertainty in the Hubble constant, which means the age of the universe estimated in this way is also uncertain by about 5%. Astronomy 2016-10-13T00:00:00Z If the models are wrong and the size of the sound horizon is different than what they predict, that adjustment would change all of the numbers derived from it, including the Hubble constant. Have We Mismeasured the Universe? 2019-02-06T05:00:00Z These results are so good that they now disagree with results from the European Planck spacecraft, which predict a Hubble constant of 67. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z The investigators of the Hubble constant see three possibilities. How a Dispute over a Single Number Became a Cosmological Crisis 2020-02-18T05:00:00Z But even accounting for the known acceleration, the tension suggests something strange may be happening to dark energy to cause the Hubble constant to diverge this much. The Universe's Fate Rests on the Hubble Constant--Which Has So Far Eluded Astronomers 2019-01-30T05:00:00Z Remarkable progress toward pinning down the Hubble constant has been made in the last couple of decades. Astronomy 2016-10-13T00:00:00Z Using astronomical data collected by others, he also derived a rate of expansion, today known as the Hubble constant. Belgian priest recognized in Hubble law name change 2018-10-29T04:00:00Z But it did not measure the Hubble constant directly. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z But in the future, researchers expect standard sirens to nail down the Hubble constant with an error of less than 1 percent. Here Come the Waves 2018-05-22T04:00:00Z A burst of gravitational waves from the merger of two black holes is one piece of the new method for calculating the Hubble constant. The Universe's Fate Rests on the Hubble Constant--Which Has So Far Eluded Astronomers 2019-01-30T05:00:00Z We now know that the Hubble constant does change with time. Astronomy 2016-10-13T00:00:00Z This rate is known as the Hubble constant, and there are two ways of measuring it. The two ways to measure how fast the universe is growing do not agree 2018-05-17T04:00:00Z In short, Planck’s Hubble constant is based on a cosmic baby picture. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z The answer to the question of the universe’s expansion rate is something called the Hubble constant, named after the astronomer Edwin Hubble who discovered in the 1920s that the universe is expanding. Cosmic Conflict: Diverging Data on Universe's Expansion Polarizes Scientists 2018-05-16T04:00:00Z The mismatch is significant and problematic because the Hubble constant is widely regarded as the most fundamental number in cosmology. The answer to life, the universe and everything might be 73. Or 67 2018-05-10T04:00:00Z Assume that the Hubble constant has been constant since the Big Bang. Astronomy 2016-10-13T00:00:00Z But in the future, researchers expect standard sirens to nail down the Hubble constant with an error of less than 1%. How gravitational waves could solve some of the Universe’s deepest mysteries 2018-04-10T04:00:00Z It so happens that this increase in dark energy also would be just enough to resolve the discrepancy in measurements of the Hubble constant. Have Dark Forces Been Messing With the Cosmos? 2019-02-25T05:00:00Z The Hubble constant codifies this relationship between cosmic distances and velocities. Cosmic Conflict: Diverging Data on Universe's Expansion Polarizes Scientists 2018-05-16T04:00:00Z However, this newest estimate stands in stark contradiction with an independent measure of the Hubble constant based on observations of ancient light that was released shortly after the Big Bang. The answer to life, the universe and everything might be 73. Or 67 2018-05-10T04:00:00Z If the Hubble constant is 20 km/s per million light-years, what is its velocity? Astronomy 2016-10-13T00:00:00Z Additional standard siren measurements from future gravitational-wave sources will enable the Hubble constant to be constrained to high precision. A gravitational-wave standard siren measurement of the Hubble constant : Nature : Nature Research 2017-10-15T04:00:00Z Calculations based on these values help cosmologists arrive at the “Hubble constant,” the rate at which the universe is expanding. Analysis | What the new gravitational waves discovery means for the future of astronomy 2017-10-17T04:00:00Z The Hubble constant reflects the sum total of all the stuff in the universe and the forces acting on it—weighing in on whether gravity or the void will ultimately win this intergalactic tug-of-war. Cosmic Conflict: Diverging Data on Universe's Expansion Polarizes Scientists 2018-05-16T04:00:00Z “The Hubble constant quantifies all that into one number.” The answer to life, the universe and everything might be 73. Or 67 2018-05-10T04:00:00Z Distances derived from redshifts assume that the Hubble constant has been truly constant for all time. Astronomy 2016-10-13T00:00:00Z We do not adopt this approach for NGC 4993, however, so that our inference of the Hubble constant is fully independent of the electromagnetic distance scale. A gravitational-wave standard siren measurement of the Hubble constant : Nature : Nature Research 2017-10-15T04:00:00Z For years, scientists have puzzled over what's known as the "Hubble constant," a number that describes the accelerating expansion of the universe. Scientists detect gravitational waves from a new kind of nova, sparking a new era in astronomy 2017-10-16T04:00:00Z The Hubble constant knows—but until the tension is resolved, the answer is unclear. Cosmic Conflict: Diverging Data on Universe's Expansion Polarizes Scientists 2018-05-16T04:00:00Z Sandage, Hubble's designated scientific heir, had spent decades refining the Hubble constant, and had consistently defended a slow rate of expansion. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z Throughout this chapter, we have referred to the Hubble constant. Astronomy 2016-10-13T00:00:00Z However, within the approximately 190-Mpc horizon redshift corrections are at most about 5%, and the Hubble constant measurement is a weak function of these, meaning that the overall effect is even smaller. A gravitational-wave standard siren measurement of the Hubble constant : Nature : Nature Research 2017-10-15T04:00:00Z The Hubble constant is calculated by observing how rapidly galaxies in the relatively nearby Universe move away from the Milky Way, using stars of known intrinsic brightness called 'standard candles'. Measurement of Universe's expansion rate creates cosmological puzzle 2016-04-10T04:00:00Z But that boost, it seems, would still fall short of the Hubble constant the SH0ES team and other groups observe in the universe today. Cosmic Conflict: Diverging Data on Universe's Expansion Polarizes Scientists 2018-05-16T04:00:00Z It could mean that current theories are missing some ingredient that intervened between the present and the ancient past, throwing off the chain of inferences from the CMB to the current Hubble constant. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z The yellow square marks the present in all four cases, and for all four, the Hubble constant is equal to the same value at the present time. Astronomy 2016-10-13T00:00:00Z The Hubble constant H0 measures the mean expansion rate of the Universe. A gravitational-wave standard siren measurement of the Hubble constant : Nature : Nature Research 2017-10-15T04:00:00Z One of the telescope's first jobs was to reduce the uncertainty in the cosmic expansion rate — the 'Hubble constant' — named, like the telescope, after its discoverer Edwin Hubble. Astronomy: Hubble's legacy 2015-04-14T04:00:00Z These would rely on surveys of previously inaccessible stellar populations or even observations of gravitational waves from large numbers of colliding neutron stars to obtain additional independent measurements of the Hubble constant. Cosmic Conflict: Diverging Data on Universe's Expansion Polarizes Scientists 2018-05-16T04:00:00Z Now, Riess's team is leading the quest to pin down the Hubble constant in nearby space and beyond. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z If the Hubble constant is around 20 kilometers/second per million light-years, the critical density is about 10–26 kg/m3. Astronomy 2016-10-13T00:00:00Z The rate of expansion, known as the Hubble constant, provides a measure of the age and size of the Universe. Supernova 'kaleidoscope' seen for first time 2015-03-04T05:00:00Z Moreover, Planck’s value for the Hubble constant, which describes the rate of expansion of the Universe, is surprisingly low compared with estimates made with other astronomical techniques — perhaps a hint of new physics in play. Planck snaps infant Universe 2013-03-27T18:20:16.717Z In 1929, Hubble independently put forward and confirmed the same idea, and the parameter later became known as the Hubble constant. Hubble cleared 2011-11-15T17:20:10.730Z But since then, the astronomical measurements of the Hubble constant have inched higher, even as error bars have narrowed. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z If the Hubble constant were twice what it actually is, how much would the critical density be? Astronomy 2016-10-13T00:00:00Z The paper also removes from one equation Lemaître's version of the Hubble constant. Amateur Historian Claims Edwin Hubble Censored Rival's Work 2011-06-27T22:45:02.583Z His isolation grew when he became embroiled in a seemingly endless and bitter controversy now known as the Hubble wars, about the Hubble constant, a number that told how big and old the universe was. He Was Mr. Universe, but He Was Really in Love With the Stars 2010-11-22T20:48:00Z Wendy Freedman, his boss as director of Carnegie as well as a rival in the Hubble constant question, referred to him on Tuesday as the last giant of 20th-century observational cosmology. Allan Sandage, Astronomer, Dies at 84; Charted Cosmos?s Age and Expansion 2010-11-18T07:20:00Z But in late January, astrophysicist Sherry Suyu of the Max Planck Institute for Astrophysics in Garching, Germany, and her collaborators published their current best guess at the Hubble constant. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z Only a few decades ago, astronomers were arguing about whether the Hubble constant was around 50 kilometers/second/million parsecs or 100 kilometers/second/ million parsecs. Astronomy 2016-10-13T00:00:00Z The conversion of redshift to a distance depends on certain properties of the universe, including the value of the Hubble constant and how much mass it contains. Astronomy 2016-10-13T00:00:00Z They were intrinsically brighter and thus farther away than Hubble thought, which, in addition to other corrections, implied a much lower Hubble constant. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z We may never know the fate of the universe or the Hubble constant, he once said, but the quest and discoveries made along the way were more important and rewarding than the answer anyway. Allan Sandage, Astronomer, Dies at 84; Charted Cosmos?s Age and Expansion 2010-11-18T07:20:00Z The speed of that flow came to be called the Hubble constant. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z In any case, if the Hubble constant is not really a constant when we look over large spans of space and time, then the calculation of galaxy distances using the Hubble constant won’t be accurate. Astronomy 2016-10-13T00:00:00Z But then came the physicist, who had an independent way of calculating the Hubble constant with the most distant, redshifted thing of all: the microwave background. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z But over the past few years, it has been yielding Hubble constant values in line with Planck's. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z I don’t think anybody should tell you that he’s slogged his way through 25 years on a problem and there’s only one reward at the end, and that’s the value of the Hubble constant. Allan Sandage, Astronomer, Dies at 84; Charted Cosmos?s Age and Expansion 2010-11-18T07:20:00Z But in a twist Sandage himself might savor, new techniques suggest that the Hubble constant is 8% lower than a leading number. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z |
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