Einstein considered that the cyclical model was an alternative to the idea that the universe is expanding.
This idea is that the universe starts with a big bang and ends with a big crunch. The universe will then "rinse and repeat."
Like this theory, Friedrich Nietzsche, wrote a scientific theory called eternal return. It considers time and space to repeat and the exact moments within them repeat as well.
In other words, our lives- and everything that happens to us will repeat over, and over, and over...
What do you think of this idea? Will we all just do it over again? Is the thought depressing?