Submitted by _bidooflr_ t3_11isl13 in askscience
Aseyhe t1_jb1txf9 wrote
Reply to comment by fizzbish in Does the age of the universe depends on where you are? by _bidooflr_
An individual photon doesn't have a rest frame, but the CMB rest frame is the center-of-momentum frame of a collection of photons. Since the photons have all different momenta, their center of momentum doesn't move at the speed of light.
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