10 Theories About What Happens After The Universe Dies

All right, let's go. Number 10, the eternal return. In 1882, philosopher Friedrich Nietzsche proposed an idea that had haunted thinkers since ancient Greece but never received a scientific framework. What if the universe doesn't end once? What if it ends and begins again, repeating the exact same sequence of events for eternity? Nietzsche called it eternal recurrence and treated it as a thought experiment. Modern cosmology suggests it might be inevitable.