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?

In: 1

Answer 1

Space itself is neither cold nor hot. Space itself is not a thing so it has no temperature, only stuff *in* space has temperature. There are also no “edges” where the universe is expanding, that’s not how the expansion of space works. Space is expanding in the sense that everything in space is moving farther away from everything else, it is NOT like an explosion with some outer edge that expanding.