3 ms·
We don’t assume it’s infinite, we assume it’s expanding. That’s the reason why there is supposed to be an end to the universe, I.e: the Big Bang and the Big Cru
by ulizzle 3y ago
We don’t assume it’s infinite, we assume it’s expanding. That’s the reason why there is supposed to be an end to the universe, I.e: the Big Bang and the Big Crunch
As for physical distance, that’s very large. Relativity is about time not space.
- eru 3y agoIt's not actually clear that the Big Bang was the absolute beginning. There could have been things before. These days, I hear much more talk about 'inflation' than about the big bang. The Big Crunch is currently seen as unlikely: the (observable) universe doesn't have enough matter to slow expansion and pull back together, expansion even seems to be accelerating. > Relativity is about time not space. Isn't it about both?
- gpderetta 3y agoThe current consensus is that the universe is indeed infinite. The fact that it is also expanding is not a contradiction .
- mr_mitm 3y agoWe don't assume either. We assume the universe is homogeneous and isotropic and that GR describes the world. Expansion follows from that and some observations. Finiteness is currently undetermined. It could be infinite, but it could also just be finite and really really big.