Which idea describes the big crunch?

Question

1. The universe goes through infinite cycles of expansion and contraction.
2. The universe is not only composed of the objects that we can see.
3. After the universe reaches its expansion limit, gravity will pull it all back together.
4. The Big Bang actually never occurred, and the universe must have a different origin.

Answer 1

The idea that describes the big crunch is:

3. After the universe reaches its expansion limit, gravity will pull it all back together.

The big crunch is a theoretical scenario in which the expansion of the universe eventually slows down and reverses, leading to a collapse back into a singular state due to gravitational attraction.