We have a theory for expansion of the universe. It is called “the big bang theory”.

However according to the math our universe should slow down expanding, but we can observe it is speeding up. Solution? Dark Energy.

There are models that try to simulate the orbits and shit of things we can see. Now those models aren’t working however… Solution? Dark matter.

This is very run down concept of what dark matter and energy is. Basically shit we need for the math to work out to the observation we make.

However I don’t think we are inside a black hole. This would mean that instead of mostly nothing our universe would be cramped with matter…