Red Shift

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Red Shift

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In astronomy, the displacement of observed spectral lines toward the longer wavelengths of the red end of the spectrum. Compare space reddening. </dd>
The term red shift is applied both to the Doppler effect caused by the relative speed of recession of the observed body and the gravitational or relativistic shift in which the frequency of light emitted by atoms in stellar atmosphere is decreased by a factor proportional to the mass-radius relationship of the star. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use