Some scientists have hypo thesize that the universe has been going in cycles of expanding and contracting over and over forever this idea is called

the "cyclical model" of the universe. This model suggests that the universe goes through phases of expansion, reaching a maximum size, and then contracting back down to a singular point, only to expand again in a never-ending cycle. This theory is one possible explanation for the eventual fate of the universe, as well as the origin of the Big Bang and the existence of multiple universes. However, it is still a topic of debate and research in the scientific community.