Question: Do you think we could recreate the big bang as a reverse?

Laurence Perreault Levasseur answered on 14 Jun 2014:

I’m not sure I understand what you mean by ‘as a reverse’, but if you mean ‘going back in time’, the only way we can get really close to recreating the Big Bang is by using computer simulations. Doing that, we can get really close to the moment of the big bang (like a billionth of a billionth of a billionth of a millionth of a second after the Big Bang), but we cannot simulate the moment of the Big Bang itself, because we do not understand how the laws of physics worked at the exact moment of the Big Bang. Maybe one day, we will have a good theory of physics that will allow us to do that, but not yet. Still, this is only using computer simulations. We cannot actually make the real Universe go back in time to the moment of the Big Bang to recreate it (that’s impossible).

Maybe you mean to ‘make a Big Bang in a lab’. That’s not possible right now either, and I don’t think it’ll be possible in the near or foreseeable future. If it ever becomes possible, I think the people of the future should be extremely careful not to do it, because that could be very dangerous!!

Or maybe you mean that, if we go far enough in the future, maybe the Universe will contract back and eventually the opposite of what happened during the big bang will happen again, just in reverse (that is called a Big Crunch). This possibility is almost completely excluded by observations now. From what we see, it looks like the Universe is expanding faster and faster, so it won’t ever slow down and start contracting.

Let me know if that answers your question!