lets talk about a multiverse
is it possible that our universe is expanding into another universe? one big ass infinite original universe, or we can call it the oververse, where multiple big bangs happened over time and now our universe expands and destroys the older universes around. but there is no way to prove this right? i mean, there are atleast one big bang happened, so why not multiple big bangs? maybe there is already another big bang and a new universe that destroys ours with over lightspeed and we have no way to see it coming.
i know this is all speculation. any thoughts?

pic related. i drawed this nice and informative pic for you. red is our universe, black are the other once.