If the density of the Universe is less than the critical density, then...
A) the Universe will expand forever.
B) the Universal expansion will eventually stop sometime in the future.
C) the Universe will eventually stop expanding, and then begin to collapse until it ends in a Big Crunch
D) the Universe will not change because its evolution does not depend on the critical density.

Question

Quizplus · Accepted Answer

If the density of the Universe is less than the critical density, the gravitational pull is not strong enough to halt the expansion, so the Universe will continue to expand forever.

If the Density of the Universe Is Less Than the Critical