Hi, before I go on about my theory, I'm only 14 years old, so it obviously might contain mistakes. My theory is that once Dark Matter and Energy starts to become weaker, and everything starts moving closer and closer due to Gravity, the Big Bang will happen again the exact same way as it did before, therefore everything will happen the exact same way (e.g. me having a glass of water, or discussing to someone how my day was) as it is now using the Law of Determinism. This will continue for an infinite amount of times. Thanks!