Red Shift

Astronomical Dictionary

The lengthening of the wavelength of electromagnetic radiation caused by relative motion between source and observer. Spectral lines are red-shifted from distant galaxies, indicating that the galaxies are moving away from us due to the expansion of the Universe. This is one of the central facts in the Expanding Universe Theory.

 
Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

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Astronomical Dictionary
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