Submitted by _bidooflr_ t3_11isl13 in askscience
clocks212 t1_jb109x2 wrote
Reply to comment by Aseyhe in Does the age of the universe depends on where you are? by _bidooflr_
Does the cosmic background radiation have a different velocity relative to the earth in different directions, or as far as we can tell we can consider all of the CMB in every direction to be identically “stationary”.
Aseyhe t1_jb12c8v wrote
The CMB frame is different in different places. It's also the frame of a comoving observer -- that is, one who is moving only due to the expansion of the universe and does not have further ("peculiar") motion. So if we consider distant galaxies in some direction, they are receding in that direction, and so is their CMB frame.
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