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PvtDeth t1_jb3eo5n wrote

How can you use the CMB as a reference frame if it is roughly uniform in every direction?


Aseyhe t1_jb46ate wrote

It's only isotropic (the same in every direction) if you're in the CMB rest frame. Otherwise, due to the Doppler effect, one direction will be blueshifted and the other redshifted.