Archived Is it possible that light itself is powering the expansion of the Universe? (AskScience)
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Archived Is it possible that light itself is powering the expansion of the Universe? (AskScience)
submitted ago by cobeast
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[–] sqeak 0 points 3 points 3 points (+3|-0) ago (edited ago)
The red-shift isn't caused by distance but by the Doppler effect which causes the wavelength to be shifted (or stretched) as the object moves away from us faster. Or blue-shifted if it's coming at us as the wavelength gets shorter (or compressed).