Red shift

This article is about the physical phenomenon. For the photochemical usage, see bathochromic shift. For other uses of the phrase "red shift" or "redshift", see redshift (disambiguation).In physics and astronomy, redshift occurs when the electromagnetic radiation, usually visible light, that is emitted from or reflected off an object is shifted toward the (less energetic) red end of the electromagnetic spectrum. More generally, redshift is defined as an increase in the wavelength of electromagnetic radiation received by a detector compared with the wavelength emitted by the source. This increase in wavelength corresponds to a decrease in the frequency of the electromagnetic radiation. Conversely, a decrease in wavelength is called blue shift.
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Noun
1. (astronomy) a shift in the spectra of distant galaxies toward longer wavelengths; generally interpreted as the Doppler effect resulting from the velocity at which they recede as the universe expands
(hypernym) Doppler effect, Doppler shift
(classification) astronomy, uranology

The lengthening of the wavelength of spectral lines, caused, either by the motion of the source away from the observer, or by the motion of the observer away from the source. Spectral lines are redshifted from distant galaxies . This is interpreted to mean that the galaxies are moving away from us, due to the expansion of the universe.

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Eng: red shift
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