| 单词 | red shift |
| 例句 | But some other exotic mechanism will be required to explain the red shift. 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 What we actually see, however, is almost exclusively red shifts no matter what distant objects beyond the Local Group we point our telescopes to. Cosmos 1980-01-01T00:00:00Z Since we think there may be massive black holes at the centers of some galaxies, this is a conceivable explanation of their red shifts. Cosmos 1980-01-01T00:00:00Z This suggested that the red shift was instead caused by the expansion of the universe, which, in turn, meant that the object was a very long distance away. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z So it predicted that the red shift of a galaxy should be directly proportional to its distance from us, exactly as Hubble found. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The red shift gives the speed at which galaxies are retiring, but doesn’t tell us how far away they are to begin with. A Short History of Nearly Everything 2003-05-06T00:00:00Z But then we should expect as many explosion fragments traveling toward us as away from us, as many blue shifts as red shifts. Cosmos 1980-01-01T00:00:00Z Skeptics argue coincidental alignment and the conventional Hubble-Humason interpretation of the red shift. Cosmos 1980-01-01T00:00:00Z There is nevertheless a nagging suspicion among some astronomers that all may not be right with the deduction, from the red shifts of galaxies via the Doppler effect, that the universe is expanding. Cosmos 1980-01-01T00:00:00Z Or the red shift might be a Doppler effect due not to the general expansion of the universe but rather to a more modest and local galactic explosion. Cosmos 1980-01-01T00:00:00Z There is also the problem that access to telescopes is always at a premium and historically measuring red shifts has been notably costly in telescope time. A Short History of Nearly Everything 2003-05-06T00:00:00Z 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 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 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 If the universe were expanding faster in some directions than in others, the intensity of the radiation in those directions would be reduced by an additional red shift. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The most obvious explanation of the red shift was in terms of the Doppler effect: the galaxies were receding from us; the more distant the galaxy the greater its speed of recession. Cosmos 1980-01-01T00:00:00Z This red shift, observed in the spectral lines of distant galaxies and interpreted as a Doppler effect, is the key to cosmology. 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 If the red shift is due to the expansion of the universe, very different red shifts imply very different distances. Cosmos 1980-01-01T00:00:00Z More surprising still was the finding that Hubble published in 1929: even the size of a galaxy’s red shift is not random, but is directly proportional to the galaxy’s distance from us. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z But there are other kinds of red shifts in nature. Cosmos 1980-01-01T00:00:00Z The apparent recession of the galaxies, with the red shift interpreted through the Doppler effect, is not the only evidence for the Big Bang. Cosmos 1980-01-01T00:00:00Z Hubble measured the distance from the stars and the extent of the red shift. Listen up, Marco Rubio!: Science lessons for the tea party 2012-11-25T19:00:00Z Since 2009, Riess and his colleagues have used various telescopes to create an elaborate “distance ladder” of the distances and red shifts of nearby galaxies. The universe’s puzzlingly fast expansion may defy explanation, cosmologists fret 2023-10-31T04:00:00Z Even after adjusting the diopter, white text on the outer edges of the EVF has green and red shifts that I never got used to. 1,000 photos with Hasselblad’s new 100-megapixel camera 2022-09-08T04:00:00Z All galaxies farther away than about 50×106 ly exhibit a red shift in their emitted light that is proportional to distance, with those farther and farther away having progressively greater red shifts. College Physics for AP Courses 2015-08-12T00:00:00Z The red shift is a consequence of the Doppler effect. Physical Geology 2015-01-01T00:00:00Z The star spotted by Mr. Welch and his colleagues possesses what astronomers call a red shift of 6.2, far higher than the previous record-holder for most distant single star. Hubble Space Telescope Spots Earliest and Farthest Star Known 2022-03-30T04:00:00Z “You will see a red shift to some of these numbers on Election Day. Then you will get the aftercount.” Kamala Harris stumps with Gavin Newsom ahead of the recall vote: ‘Everyone has to vote’ 2021-09-08T04:00:00Z The red shift in the border region is a question of engagement, Castro said. Why Texas’s overwhelmingly Latino Rio Grande Valley turned toward Trump 2020-11-09T05:00:00Z What does this imply, assuming that the only source of red shift is relative motion? College Physics for AP Courses 2015-08-12T00:00:00Z Before we get to the Doppler effect as it pertains to the red shift, let’s see how it works on something more tangible. Physical Geology 2015-01-01T00:00:00Z That star, reported in 2018, had a red shift of 1.5, corresponding to when the universe was about four billion years old. Hubble Space Telescope Spots Earliest and Farthest Star Known 2022-03-30T04:00:00Z These little bangs are responsible for light elements and the red shifts of galaxies. Remembering Big Bang Basher Fred Hoyle 2020-04-11T04:00:00Z A machined aluminum instrument panel and translucent red shift knob with metal flake and a vintage Cummins logo complete the look. Diesel Dodge Lowliner pickup is a retro Ram custom 2019-10-30T04:00:00Z He then found that all but the closest galaxies have a red shift in their hydrogen spectra that is proportional to their distance. College Physics for AP Courses 2015-08-12T00:00:00Z We are looking at dead-heat races in Nevada, Indiana and Arizona where you shouldn’t be surprised to see a "red shift," that is, Republican victories in races where exit polls show a Democratic win. Election expert Greg Palast: Thanks to GOP voter suppression, “Democrats may have effectively l... 2018-10-28T04:00:00Z It might even be able to spot some of the stars at a red shift between 10 and 20, corresponding to a period between 100 million and 500 million years after the Big Bang. Hubble Space Telescope Spots Earliest and Farthest Star Known 2022-03-30T04:00:00Z The theory rests on three solid pillars of evidence: the red shift of galaxies, the microwave background and the abundance of light elements, which were supposedly synthesized during our universe’s fiery birth. Remembering Big Bang Basher Fred Hoyle 2020-04-11T04:00:00Z In a measurement of unprecedented accuracy they found a gravitational red shift in light from the sun almost exactly equal to that predicted by the general theory of relativity. 100 Years Ago: Lighter Than Air 2012-03-03T13:45:02.307Z The explanation is that there is a cosmological red shift due to the expansion of space itself. College Physics for AP Courses 2015-08-12T00:00:00Z At high red shifts, the most distant supernovae are dimmer than they would be if the universe were slowing down. Nobel Dreams: 2011 Physics Prize Honors Accelerating Universe 2011-10-05T11:15:00.287Z Spectra of the much denser white-dwarf stars, where the red shift is expected to be 40 times larger than on the sun, agree quite well with the theory. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z He succeeds because he recognizes that he's writing not just about red shifts and supernovae, but about people. Richard Panek's study of the cosmos,"The 4 Percent Universe" 2011-01-28T17:19:02Z The previous record, set in October, was a galaxy with a red shift of 8.5. Telescope spots oldest galaxy ever seen 2011-01-27T09:12:56Z Its value is determined by taking the slope of a graph of velocity versus distance, obtained from red shift measurements, such as shown in Figure 34.5. College Physics for AP Courses 2015-08-12T00:00:00Z If expansion was now slowing, supernovae in those distant galaxies should appear brighter and closer than their red shifts would suggest. Nobel Dreams: 2011 Physics Prize Honors Accelerating Universe 2011-10-05T11:15:00.287Z This "gravitational red shift" was predicted by Einstein. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z This galaxy has a red shift of 8.55, making it the farthest and oldest ever seen. Astronomers find oldest galaxy yet 2010-10-20T18:02:00Z Dimly, he remembered the old story of a "red shift" in the lights of approaching stars, but here he saw it pure, a sight no human eyes had ever seen. The Colors of Space Those distances are larger than expected for the observed galactic red shifts, implying the expansion was slower when that light was emitted. College Physics for AP Courses 2015-08-12T00:00:00Z The red shift of the intervening galaxy is always less than that of the one being lensed, and each image of the lensed galaxy has the same red shift. College Physics for AP Courses 2015-08-12T00:00:00Z This verification supplies more evidence that red shift is proportional to distance. College Physics for AP Courses 2015-08-12T00:00:00Z Another known cause of red shift in light is the source being in a high gravitational field. College Physics for AP Courses 2015-08-12T00:00:00Z Discuss how this can be eliminated as the source of galactic red shifts, given that the shifts are proportional to distance and not to the size of the galaxy. College Physics for AP Courses 2015-08-12T00:00:00Z And is there other evidence of the Big Bang besides the well-documented red shifts? College Physics for AP Courses 2015-08-12T00:00:00Z If some unknown cause of red shift—such as light becoming “tired” from traveling long distances through empty space—is discovered, what effect would there be on cosmology? College Physics for AP Courses 2015-08-12T00:00:00Z As galaxies move away from us, their light is shifted to a lower frequency, and so to a longer wavelength—the so-called red shift. College Physics for AP Courses 2015-08-12T00:00:00Z Double the distance, and the red shift is doubled. College Physics for AP Courses 2015-08-12T00:00:00Z While this cosmological red shift is often called a Doppler shift, it is not—space itself is expanding. College Physics for AP Courses 2015-08-12T00:00:00Z It is compelling evidence of the creation of the universe in a gigantic explosion, already indicated by galactic red shifts. College Physics for AP Courses 2015-08-12T00:00:00Z Figure 34.5 This graph of red shift versus distance for galaxies shows a linear relationship, with larger red shifts at greater distances, implying an expanding universe. College Physics for AP Courses 2015-08-12T00:00:00Z But such gravitational lensing is also useful in verifying that the red shift is proportional to distance. College Physics for AP Courses 2015-08-12T00:00:00Z Discuss how this not only shows that the images are of the same object, but also implies that the red shift is not affected by taking different paths through space. College Physics for AP Courses 2015-08-12T00:00:00Z |
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