AIUI, “Started moving away from the starting area” is wrong. The starting area is everywhere. It isn’t that there is some point where the center of the Big Ba

AIUI, “Started moving away from the starting area” is wrong. The starting area is everywhere. It isn’t that there is some point where the center of the Big Bang was. The idea is that, stuff was basically evenly distributed everywhere , and very dense, and then later, without needing the amount of stuff to have decreased, stuff is nevertheless more spread out. Now, you might just explain this with like, “well, space is infinite in extent, so you can just spread it all out, without running out of room, by moving things out towards infinity” but you can describe the same sort of situation even if space is compact, turning back around in itself (as in the analogy of “imagine space is the surface of a balloon”)