I think that the universe is infinite and eternal. According to the first law of thermodynamics, matter and energy is never created or destroyed and energy can only be converted. That means all the things that are made my matter or energy cannot be created or destroyed. The universe is made out of 100% matter and energy. Meaning that the universe cannot be created or destroyed. Probably the big bang theory is false. Probably the universe never had a beginning. When a star dies they make another star and repeats. When a planet crashes with another planet the planets make a new planet and probably a moon. You cannot fully end something or you cannot make something without using other materials. Probably I am 100% wrong. But that is my theory of the universe.