from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An increase in the wavelength of radiation emitted by a celestial body as a consequence of the Doppler effect.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Light spectra shifted towards red, as by elongation of light waves from a source moving away from the detector.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding


From the fact that the longer wavelengths of light are at the red end of the visible spectrum.
(American Heritage® Dictionary of the English Language, Fourth Edition)


Sorry, no example sentences found.


Log in or sign up to get involved in the conversation. It's quick and easy.

  • yellow shift

    September 1, 2008