None_At_All wroteRegarding the Big Bang, it's not that everything suddenly happened and expanded. The point of the Big Bang as the origin of the universe is that there is absolutely no way to see what happened before it because of its nature. Right before the big mang, there was a singulatiry. We can't erally have any idea of how that singularity came to be. Think of it like this: if you see something that changes its position towards the left by 200km each day, you can reason that it came from the right and try to track down what made it move to the left. But with the Big Bang, the knowledge of anything before the singularity is wiped.
I like to think that the big bang was a result of the Poincaré recurrece. tl;dr the Poincaré recurrence is the theory that, given enough time, all matter will return to it's original state/location.
So our universe will come to an end, and when it does, there will be a new big bang, but maybe things go down differently that time.
It still cannot explain where the matter originated, but nothing truly can.
