It's an open question and as it seems today the universe is "flat" - which is in conflict with the notion of space expanding into nothingness. In a flat universe, space was always there.In another thread, the big bang expansion was breifly mentioned. A question was asked, rough paraphrase, "Didn't the big bang expand into infinite space?" The answer given was, also rough paraphrase, "No, space itself expanded." I did a tiny bit of reading on this, and I think I understand the idea. My question is, "If space itself expanded, then is the domain of the expansion infinite nothingness?"