The conversation between human and AI assistant.
Did the universe really start with the Big Bang? What if another universe existed before it?
What about the idea that the Big Bang was not a beginning, but a bounce from a previous contracting universe?
That's certainly possible, and there are some models of the universe that suggest this may be the case. The idea is that the universe goes through a cycle of expansion and contraction, with each cycle starting with a Big Bang and ending with a Big Crunch. However, there is currently no definitive evidence to support this theory.