If the material in the universe was at the critical density, expansion would
A) continue at the current rate forever.
B) increase at an accelerating rate.
C) continually slow, but never quite stop.
D) never occur.
E) eventually slow, stop, and then reverse.

Question

Quizplus · Accepted Answer

If the universe's density is at the critical density, it would mean that the gravitational pull is just enough to slow the expansion over time, but not enough to stop it completely, leading to a universe that expands forever but at a decreasing rate.

If the Material in the Universe Was at the Critical