At the beggining i want to say sorry for my poor english. Ok, so big bang became from the state which contained time, energy, matter etc. Current theory says that there was no time before the big bang. I disagree. When child is getting life in his mothers body, from his perspective there was no time either before he was born. If he would get instantly separated and would never see other people then he would think "is this all got made when i was born?". But time started for THIS SINGLE CHILD, his mother and mother of other child were existing earlier. So can there exist many parralel universes? It could work pretty much like expansion of human being by borning new people which will born new people etc. So, there are black holes. They cummulate energy, matter, light into a state. There is theory that nothing can be transported through black hole. Yes it cant be until white hole will get open in other universe. Look , its all cummulating at the bottom of the hole, then in one moment black hole closes and white hole opens transporting state into a new universe. Now you can say people never saw white hole. Ofc they never saw and they will not see it in out universe anymore cause in my opinion, white hole was in our universe one time when state was transported to our dimension. Now, what contains empty dimension in which state wasnt transported yet? what type of matter does it have? Is it a key to our existence? Im waiting for answers, im 16, so its only a theory.