redshift

(z)
   a unit of relative distance used in astronomy. The universe is expanding, so distant galaxies are receding from the earth. The faster the speed of recession, the farther the object. Just as sound from a receding train is lowered in pitch, light from distant galaxies is shifted toward longer wavelengths, that is, toward the red end of the spectrum. The redshift equals z if the wavelength of light is z + 1 times the normal wavelength; thus a redshift of 0.40 means that the wavelength of the light is 40% longer than normal. Using the Hubble space telescope, astronomers have measured redshifts greater than 5.0.

Dictionary of units of measurement. 2015.

Look at other dictionaries:

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  • redshift — [red′shift΄] n. Astron. the shift of spectral lines toward the longer wavelengths and lower frequencies at the red end of the spectrum in a luminous celestial body, indicating that the light source is moving rapidly away from the observer:… …   English World dictionary

  • Redshift — This article is about the astronomical phenomenon. For other uses, see Redshift (disambiguation). Physical cosmology …   Wikipedia

  • Redshift — Décalage vers le rouge On se rend compte que les ondes qui proviennent d une source lumineuse sont plus longues lorsque celle ci s éloigne. Les ondes sont « étalées » et la lumière qui nous parvient est donc rougie, c est le décalage… …   Wikipédia en Français

  • redshift — /red shift /, n. Astron. a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth. Also, red shift. Cf. cosmological redshift, Doppler effect, gravitational… …   Universalium

  • redshift — noun Date: 1923 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… …   New Collegiate Dictionary

  • redshift — noun A change in the wavelength of light, in which the wavelength is longer than when it was emitted at the source. Ant: blueshift …   Wiktionary

  • redshift — n. shift toward the longer wavelengths in the spectral lines emitted by a heavenly body (caused when an object is moving away from an observation point) …   English contemporary dictionary

  • redshift — red•shift [[t]ˈrɛdˌʃɪft[/t]] n. astron. a shift in the spectrum of a celestial object toward longer wavelengths, caused by the object s movement away from the viewer • Etymology: 1920–25 red′shift ed, adj …   From formal English to slang

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