why is space cold when everything generates heat? expanding: why isn’t the expansion of space creating heat at the edges?

Question

why is space cold when everything generates heat? expanding: why isn’t the expansion of space creating heat at the edges?

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Answer 1

Sorry, space isn’t expanding at the edges any faster than it is anyplace else. It’s expanding at the same slow rate everywhere, but space is very, very large and over enough distance small changes accumulate. The space containing the Earth expands at the rate of about 1mm/year. Space is a bazillion times bigger than the Earth, and over large distances this expansion accumulates.