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- If the universe is flat and infinite, then what is the explanation of the origin of the exact opposite directions of the two nodes in the sky which are the sources of minimum and maximum cosmic microwave background (CMB) radiation? It seems reasonable to suppose that these nodes existed well before the CMB began.

The implication seems to be that from the beginning of the post expansion era, there was everywhere an average velocity of a large volume of matter which was (very near) zero everywhere with respect to a common fixed coordinate system (with a spacially uniform time expansion of distances) throughout the entire infinite universe.

I noticed that the thread https://www.physicsforums.com/threads/is-the-universe-finite-or-is-it-infinite.506986/ did not address this issue. I suggest that a finite hyper-spherical universe would require only a finite volume of a fixed coordinate system. I suppose it is just a matter of personal preference regarding whether an infinite or a finite coordinate system is more capable of producing the finite average velocity everywhere.

I noticed that the thread https://www.physicsforums.com/threads/is-the-universe-finite-or-is-it-infinite.506986/ did not address this issue. I suggest that a finite hyper-spherical universe would require only a finite volume of a fixed coordinate system. I suppose it is just a matter of personal preference regarding whether an infinite or a finite coordinate system is more capable of producing the finite average velocity everywhere.