What ideas describe the big crunch?
A: the universe goes through infinite cycles of expansion and contraction.
B: after the universe reaches its expansion limit, gravity will put it all back together.
C: The big bang actually never occurred, and the universe must have a different origin.
D: The universe is not only composed of the objects that we can see.
A: the universe goes through infinite cycles of expansion and contraction.
B: after the universe reaches its expansion limit, gravity will put it all back together.