red·​shift | \ ˈred-ˈshift How to pronounce redshift (audio) \

Definition of redshift

: a displacement of the spectrum of a celestial body toward longer wavelengths that is a consequence of the Doppler effect or the gravitational field of the source also : a measurement of a celestial body's redshift equal to the ratio of the displacement of a spectral line to its known unshifted wavelength and used especially to calculate the body's distance from earth

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Other Words from redshift

redshifted \ ˈred-​ˈshif-​təd How to pronounce redshifted (audio) \ adjective

Examples of redshift in a Sentence

Recent Examples on the Web

This wavelength increase, known as a redshift, is associated on a stellar level with age. David Grossman, Popular Mechanics, "This Supercomputer Is Out Here Just Generating Millions of Universes," 13 Aug. 2019 To get a distance to a galaxy, astronomers split its light into a spectrum and measure its redshift, or the stretching of its light by the expansion of the universe. Daniel Clery, Science | AAAS, "Robot detector to map cosmos for clues to dark energy," 11 Sep. 2019 Scientists compare general relativity’s predictions of this effect, called gravitational redshift, to the measured wavelengths of incoming light from stars like S0-2 to test whether the theory holds true. Emily Toomey, Smithsonian, "A Star Orbiting in the Extreme Gravity of a Black Hole Validates General Relativity," 25 July 2019 Almost all of our results on dark energy are going to rely crucially on this color redshift technique. Quanta Magazine, "Finding Dark Energy in the Details," 18 Sep. 2014 If an object is moving relative to the lidar sensor, this causes a slight frequency change called a redshift that is proportional to the object's velocity in the direction of the beam. Timothy B. Lee, Ars Technica, "Two Apple veterans built a new lidar sensor—here’s how it works," 2 Oct. 2018 This flips the sign of the frequency change caused by the distance to the far away object, while the sign of the redshift will be the same for both measurements. Timothy B. Lee, Ars Technica, "Two Apple veterans built a new lidar sensor—here’s how it works," 2 Oct. 2018 Richard Ellis, a professor of astrophysics at University College London and co-author of the study, tells Amos that this oxygen has a redshift of 9.1. Jason Daley, Smithsonian, "Astronomers Find Signature From the Universe’s Earliest Known Stars," 22 May 2018 Astronomers first studied faraway star surfaces by looking at the redshift or blueshift of light coming from the stars, a technique called Doppler imaging that reveals movement on the stars' surfaces. Jay Bennett, Popular Mechanics, "The Most Detailed Image of Another Star Is Also a Preview of Our Sun's Dying Days," 1 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'redshift.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of redshift

1923, in the meaning defined above

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1 Oct 2019

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Time Traveler for redshift

The first known use of redshift was in 1923

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Rhyming Dictionary: Words that rhyme with redshift Encyclopedia article about redshift

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