Question

What is end if universe

Answer 1

Then there's the "heat death" theory, in which the universe expands forever until it reaches a state of thermal equilibrium, in which nothing can happen. Yet another idea is called the big rip, in which the accelerated expansion of the universe eventually rips all matter apart, atom by atom.

Answer 2

the "heat death" theory, in which the universe expands forever until it reaches a state of thermal equilibrium, in which nothing can happen.