I have fond almost the same question here with some answers. Anyhow, I am not satisfied with the answers, or couldn't understand them well. Beside that, I would formulate the question a little bit different. Unfortunately the thread is already closed (from 2012). Provided there is only one Universe, one Continuum. With an Euclidean space, flat and infinite just as a mathematical feature (lets say only content matters physically). Our Big Bang happened, not just an explosion, but except the creation of space and time - and we are able to observe our visible universe today. Is it imaginable, just imaginable, that beyond that are other Big Bangs, from time to time, many? Just too far away for any interaction noticeable up to our horizon, until now? And more - leading to a new question - if they are all expanding like our own (assuming all known physical laws are identical, notabene one continuum, no multiverse scenarios), overlapping regions will occur. Some regions of space will see expansions from many directions and therefore this would be locally kind of a contraction - and leading to a new Big Bang, maybe. If a really giant black hole may ever lead to a new Big Bang, OK that's fantasy. The new question would be, is it imaginable that at a certain amount of too much mass a black hole "explode"? But that's worth for an own thread, probably existing many already. As far as I know, that's impossible, but who knows? Would appreciate some opinions. Sorry if my English is strange, am not a native speaker.