How far is the edge of the universe?

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Why Is Everything Made Of Atoms?

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In space speed is relative to the difference between two objects, but would it be reasonable to consider the cosmic microwave background radiation as a fixed point to judge the velocity of any particular object against, as in the delta-v of the Earth compared to the cosmic background microwave radiation as a fixed point?
#astronomy #physics #astrophysics #cosmicmicrowavebackgroundradiation #CMB