Hey everyone, I have a limited knowledge in this field, but am very interested in it and am able to understand the concepts. I wanted to talk about the 'big crunch' and one of the theories relating to it. In my studies I came across this theory, where if the big bang theory is correct and there is over a certain amount of mass in the universe, then everything will stop expanding at some point and then start coming back in on itself until it once again becomes a singularity. One of the theories I read about was that time would also reverse along with it, so we would all experience our lives in reverse, along with the rest of the universe. Is this feasible? Is it actually possible to reverse time?