| 单词 | Doppler shift |
| 例句 | The distance of the galaxy yields its age—and its Doppler shift yields its velocity. Zero: The Biography of a Dangerous Idea 2000-02-07T00:00:00Z The latest findings required researchers to painstakingly track Cassini’s motion by monitoring minute changes in the frequency of the signal it sent back to Earth, called Doppler shifts. New hope for extraterrestrial life on Saturn moon 2014-04-04T12:45:00Z The actual change in frequency due to relative motion of source and observer is called a Doppler shift. College Physics for AP Courses 2015-08-12T00:00:00Z He observed the Doppler shift in one of the hydrogen lines in the spectrum of Sirius and found that this star is moving toward the solar system. Astronomy 2016-10-13T00:00:00Z One test is to see whether the signal’s frequency drifts over time: An alien transmitter would be on a moving planet, causing a Doppler shift. How big money is powering a massive hunt for alien intelligence 2020-09-10T04:00:00Z If this effect was interpreted as a Doppler shift—the natural spreading of waves as they recede—it would imply that other galaxies were moving away from one another and from us. How Astronomers Revolutionized Our View of the Cosmos 2020-09-01T04:00:00Z Some were concerned that the Doppler shifts were from stellar pulsations, rather than orbital motion; maybe the surface of 51 Peg was bulging out, then sinking back with a regular rhythm. Who Really Discovered the First Exoplanet? 2019-11-12T05:00:00Z The reflector then acts as a moving source, producing a second Doppler shift. College Physics for AP Courses 2015-08-12T00:00:00Z Each point on the star has its own Doppler shift, so the absorption line we see from the whole star is actually much wider than it would be if the star were not rotating. Astronomy 2016-10-13T00:00:00Z Mueller studies bat behaviors, including their adaptations to the Doppler effect or Doppler shift. In the Wiggle of an Ear, a Surprising Insight into Bat Sonar 2019-06-17T04:00:00Z And simple considerations about the relativistic rotation of the disk implied that a strong Doppler shift would cause a strong asymmetry of the apparent flux. Here’s what scientists think a black hole looks like 2019-04-08T04:00:00Z Juno skims close to Jupiter's surface every 53 days, and with each pass hidden influences inside the planet exert a minute pull on the spacecraft, resulting in tiny Doppler shifts in its radio signals. Missions expose surprising differences in the interiors of Saturn and Jupiter 2019-01-17T05:00:00Z A clever technique is used to measure the Doppler shift in an echo. College Physics for AP Courses 2015-08-12T00:00:00Z The result is that the lines we observe from the entire galaxy contain the combination of many Doppler shifts. Astronomy 2016-10-13T00:00:00Z Bats use the Doppler shift to locate objects in much the same way, but far more precisely. In the Wiggle of an Ear, a Surprising Insight into Bat Sonar 2019-06-17T04:00:00Z In short, geometrically good but physically wrong because they neglected the physical properties of the accretion disk and the Doppler shift effects. Here’s what scientists think a black hole looks like 2019-04-08T04:00:00Z He backed up that claim with a limited set of previously published measurements of the distances of galaxies and their velocities, calculated from their Doppler shifts. Move over, Hubble: Discovery of expanding cosmos assigned to little-known Belgian astronomer-priest 2018-10-29T04:00:00Z The actual change in frequency is called the Doppler shift. College Physics for AP Courses 2015-08-12T00:00:00Z Suppose you were Hubble and Humason, working on the distances and Doppler shifts of the galaxies. Astronomy 2016-10-13T00:00:00Z The bats don’t get disoriented, because they adjust the frequency of the calls they produce to compensate for this “bad” Doppler shift. In the Wiggle of an Ear, a Surprising Insight into Bat Sonar 2019-06-17T04:00:00Z If it is almost face-on, the luminosity asymmetry due to the Doppler shift will not be strong. Here’s what scientists think a black hole looks like 2019-04-08T04:00:00Z That ‘Doppler shift’ allows scientists to calculate the winds’ speed and direction. World’s first wind-mapping satellite set to launch 2018-08-16T04:00:00Z The first Doppler shift is for the moving observer; the second is for the moving source. College Physics for AP Courses 2015-08-12T00:00:00Z If we apply the relativistic form of the Doppler shift formula, we find that these redshifts correspond to velocities of about 96% of the speed of light. Astronomy 2016-10-13T00:00:00Z He and Yin interpret this to mean that the bats are producing “good” Doppler shifts to alter the incoming sounds, thereby gaining more accurate information about the direction a biosonar target is traveling. In the Wiggle of an Ear, a Surprising Insight into Bat Sonar 2019-06-17T04:00:00Z There’s an extreme Doppler shift: you didn’t write the book with a view to later competing with others. What it is like to win the Booker prize, by Margaret Atwood, Hilary Mantel, Peter Carey and more 2018-06-30T04:00:00Z Tiny Doppler shifts in radio broadcasts sent from Earth to receivers on InSight will reveal other details of the martian interior. By listening for quakes on Mars, NASA lander will probe Red Planet’s interior 2018-04-18T04:00:00Z People talking when a wind moves the air between them also observe no Doppler shift in their conversation. College Physics for AP Courses 2015-08-12T00:00:00Z Astronomers measured the Doppler shift of spectral lines emitted by this gas, found its speed of rotation, and then used the speed to derive the amount of mass inside the disk—applying Kepler’s third law. Astronomy 2016-10-13T00:00:00Z These movements also added Doppler shifts to incoming sounds. In the Wiggle of an Ear, a Surprising Insight into Bat Sonar 2019-06-17T04:00:00Z He and his colleagues looked for Doppler shifts in the spectral lines of the stars' light that would be caused if a planet tugged them back and forth. What is Alpha Centauri hiding? Searches for Earth-like planets ramp up around our nearest stellar neighbor 2018-04-11T04:00:00Z Astronomers then look for tiny oscillating Doppler shifts in these lines over time, caused by planetary tugging. Telescopes around the globe power up their search for Earth-like planets 2018-01-04T05:00:00Z The greater the plane’s speed vs , the greater the Doppler shift and the greater the value observed for fobs . College Physics for AP Courses 2015-08-12T00:00:00Z From which star will you observe the greatest Doppler shift? Astronomy 2016-10-13T00:00:00Z "As the rocket gets higher and higher and accelerates, we see a decrease in the frequency in the infrasound - that's basically a Doppler shift because the source is moving away from us," says Steve. Rocket rumbles give volcanic insights 2017-12-16T05:00:00Z Iess leads Cassini’s radio experiment team, which used tiny Doppler shifts in the spacecraft’s radio signal to determine the mass of objects it orbited. Saturn’s rings are a recent addition to the solar system, Cassini observations show 2017-12-12T05:00:00Z As the spacecraft plunged through these orbits, a radio telescope in Argentina, run by the European Space Agency, NASA's partner on the mission, listened for tiny Doppler shifts in Cassini's signal. After a dive into Saturn, Cassini spacecraft melts into history 2017-09-15T04:00:00Z First discussed for sound waves, a Doppler shift occurs in any wave when there is relative motion between source and observer. College Physics for AP Courses 2015-08-12T00:00:00Z In reality, the Doppler shifts we measure are extremely small and require sophisticated equipment to be detected. Astronomy 2016-10-13T00:00:00Z As the spacecraft plunges toward the rings in subsequent orbits, a radio telescope in Argentina will be listening for tiny Doppler shifts in Cassini’s signal. In mission's last hurrah, Cassini aims to solve riddle of Saturn's rings 2017-04-13T04:00:00Z That motion would, in turn, shorten or stretch the time between pulses from pulsars in different directions, in an effect akin to the Doppler shift. Ripples in spacetime: Science's 2016 Breakthrough of the Year 2016-12-22T05:00:00Z Astronomers monitoring the star detected a periodic increase and decrease in frequency every 11.2 days, caused by Doppler shifts in the light as the unseen planet repeatedly tugged the star toward and away from us. From AI to protein folding: Our breakthrough runners-up 2016-12-22T05:00:00Z The relativistic Doppler shift is easy to observe. College Physics for AP Courses 2015-08-12T00:00:00Z These planets cause the biggest “wiggles” in the motion of their stars and the biggest Doppler shifts in the spectrum. Astronomy 2016-10-13T00:00:00Z These motions broaden the spectral line through Doppler shifts, or the change in the wavelength of light given off by an object depending on its motion relative to an observer. The Milky Way’s dark twin revealed 2016-07-25T04:00:00Z Basic physics tells us that light emitted from a source moving toward you becomes bluer, and gets redder from a source moving away from you—the famous Doppler shift. Was Einstein the First to Invent E = mc 2 ? 2015-08-24T04:00:00Z A centimeter-per-second velocity shift will leads to a Doppler shift that changes the frequency of visible light by tens of kilohertz, or less than a billionth of the frequency. Using Ultrafast Lasers To Look For Earth-like Worlds 2015-06-18T04:00:00Z In astronomical observations, the relativistic Doppler shift provides velocity information such as the motion and distance of stars. College Physics for AP Courses 2015-08-12T00:00:00Z The strongest confirmation happens when ground-based telescopes are also able to detect a Doppler shift with the same period as the transits. Astronomy 2016-10-13T00:00:00Z In principle this could be detected by slight shifts in the wavelengths of light from the star, like the Doppler shift that causes the pitch of an ambulance siren to change as it goes past. | Geoffrey W. Marcy: Finder of New Worlds 2014-05-12T21:37:37Z These observations will need to span many years of careful collection of Doppler shifts. Telescope Apps Help Amateurs Hunt for Exoplanets 2014-04-18T17:00:00Z 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 A highway patrol officer uses a device that measures the speed of vehicles by bouncing radar off them and measuring the Doppler shift. College Physics for AP Courses 2015-08-12T00:00:00Z The visible star in this binary system is spectral type O. Measurements of the Doppler shifts of the O star’s spectral lines show that it has an unseen companion. Astronomy 2016-10-13T00:00:00Z And at present, it is well outgunned by searches based on detecting Doppler shifts. Readers Respond to "Quantum Weirdness" 2013-09-21T11:15:00.690Z 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 The recent conference I attended at the Lowell Observatory in Flagstaff to celebrate the 100th anniversary of his first measured Doppler shift, was a great opportunity to learn more about him. A Giant In Hubble's Shadow 2012-10-03T14:50:25Z Note that there are two Doppler shifts in echoes. College Physics for AP Courses 2015-08-12T00:00:00Z The greater the motion toward or away from us, the greater the Doppler shift. Astronomy 2016-10-13T00:00:00Z With the Keck II telescope in Hawaii, the astronomers then detected Doppler shifts from different parts of the galaxy's disk, indicating it spins as fast as the Milky Way does. Hubble Spots the Farthest Spiral Galaxy Ever Seen 2012-07-18T18:38:13Z Coupled with the orbital period, the poison gas's Doppler shift reveals that the planet's orbit is tilted 45 to our line of sight and that the world itself weighs six times more than Jupiter . ScienceShot: Weighing an Alien Planet 2012-06-27T19:15:00Z By using telescopes in Chile, the astronomers measured Doppler shifts and thus velocities of gas in the Trifid. The Year in Pictures 2011-12-22T19:11:37Z Doppler shifts and sonic booms are interesting sound phenomena that occur in all types of waves. College Physics for AP Courses 2015-08-12T00:00:00Z The Doppler shift is thus not easily detected in a continuous spectrum and cannot be measured accurately in such a spectrum. Astronomy 2016-10-13T00:00:00Z Astronomers measure how fast a star's surface spins by exploiting the Doppler shift. Giant Stars Bare Their Whirling Hearts 2011-12-07T18:01:00Z The magnitude of that Doppler shift reflected the strength of Lutetia's gravitational pull and therefore its mass. Hard Rock: Asteroid Lutetia May Be an Intact Leftover from Planetary Formation 2011-10-28T21:45:05.277Z Rather, Doppler shifts spread them into wide lines surrounding that wavelength. Some supermassive black holes may not be so super after all 2011-02-18T21:45:02.483Z In meteorology, the Doppler shift is used to track the motion of storm clouds; such “Doppler Radar” can give velocity and direction and rain or snow potential of imposing weather fronts. College Physics for AP Courses 2015-08-12T00:00:00Z The wavelengths of the absorption lines can be measured accurately, however, and their Doppler shift is relatively simple to detect. Astronomy 2016-10-13T00:00:00Z As many as a third move in the opposite direction as their star spins, a fact deduced from the way the periodic dimming of starlight brings out the Doppler shift of the spinning star. Why don't exoplanets match astronomers' expectations? A dispatch from the American Astronomical Society meeting 2011-01-13T19:15:07.747Z 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 "I was completely ignorant of the Doppler shift effect," Costas told me. The Dawn of Amateur Radio in the U.K. and Greece: a personal view For example, there is no Doppler shift in the frequency of conversations between driver and passenger on a motorcycle. College Physics for AP Courses 2015-08-12T00:00:00Z The speed can be calculated using the Doppler shift formula: Astronomy 2016-10-13T00:00:00Z The grammar tortured to produce the verbal Doppler shifts essential to disguise the source of the information, its distance from reality, the speed of its degeneration into rigid official versions. After the Rain : how the West lost the East Because the cells are moving, two Doppler shifts are produced—one for blood as a moving observer, and the other for the reflected sound coming from a moving source. College Physics for AP Courses 2015-08-12T00:00:00Z A Doppler shift in the radar echo can be used to determine the speed of a car or the intensity of a rainstorm. College Physics for AP Courses 2015-08-12T00:00:00Z Another major use of ultrasound in medical diagnostics is to detect motion and determine velocity through the Doppler shift of an echo, known as Doppler-shifted ultrasound. College Physics for AP Courses 2015-08-12T00:00:00Z From which star will you observe the smallest Doppler shift? Astronomy 2016-10-13T00:00:00Z 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 When a radar beam is reflected from a rotating planet, the motion of one side of the planet’s disk toward us and the other side away from us causes Doppler shifts in the reflected signal. Astronomy 2016-10-13T00:00:00Z If a star is rotating rapidly, there will be a greater spread of Doppler shifts and all its spectral lines should be quite broad. Astronomy 2016-10-13T00:00:00Z The magnitude of the Doppler shift in an echo is directly proportional to the velocity of whatever reflects the sound. College Physics for AP Courses 2015-08-12T00:00:00Z Doppler shifts cause the spectral lines to move back and forth. Astronomy 2016-10-13T00:00:00Z If the spectral lines of both stars are visible in the spectrum of the binary, then the speed of the smaller star with respect to the larger one can be measured from the Doppler shift. Astronomy 2016-10-13T00:00:00Z Since stars don’t show Doppler shifts this large, no one had thought of considering high redshifts to be the cause of the strange spectra. 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。