Question

which idea describes the big crunch? (1 point)

the universe goes through infinite cycles of expansion and contraction.

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

the big bang actually never occurred, and the universe must have a different origin.

the universe is not only composed of the objects that we can see.

Explanation:

The Big Crunch theory proposes that after the universe's expansion reaches a limit, gravitational forces will cause it to contract back together. The first option describes cyclic expansion - contraction (Big Bounce - like), the third is about Big Bang's validity, the fourth is about dark matter/energy. Only the second option matches the Big Crunch's core idea of gravity pulling the universe back after expansion limit.

Answer:

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