According to the laws of conservation of matter, energy and momentum, the universe must be self-existent and immortal. The temperatures of the stars and planets must be stable.
If the universe had a beginning, what came before it?
If the Earth was formed from a cloud of hot gas that cooled, how could there be heavy elements on the surface of the Earth? The heavy metals should have all sunk into the molten core and become alloys. Sand should be glass.
Before 19 century the universe was stable. The Big Bang theory is false.