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[red-shift] /ˈrɛdˌʃɪft/
noun, Astronomy
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.
1920-25; red1 + shift Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for redshift
  • Measuring a galaxy's redshift tells how long ago its light was emitted.
  • The thing about photons is that they redshift, losing energy as space expands.
  • redshift shows the spacetime between galaxies is expanding.
  • The amount of a galaxy's redshift tells astronomers how fast the galaxy is moving away from us.
  • Over vast distances in the universe, this predicts that redshift of the gauge bosons weakens the gravitational coupling constant.
  • The bigger uncertainty is whether supernovae at high redshift are qualitatively different from local supernovae.
  • Its explanations of cosmic expansion, redshift and cosmological horizons are superb.
  • Their redshift indicates how much the universe has expanded since then.
  • The redshift dependence is both a blessing and a curse.
  • Your question about the redshift of a single photon is a great one.
British Dictionary definitions for redshift


a shift in the lines of the spectrum of an astronomical object towards a longer wavelength (the red end of an optical spectrum), relative to the wavelength of these lines in the terrestrial spectrum, usually as a result of the Doppler effect caused by the recession of the object Compare blueshift
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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