If the density of the universe is lower than the critical density, this means that:
A)the universe is expanding at a rate equal to the escape speed of the universe.
B)the universe is expanding at a rate less than the escape speed of the universe.
C)the universe is expanding at a rate greater than the escape speed of the universe.
D)the universe is expanding at a rate equal to the speed of light.
E)the universe is expanding at a rate greater than the speed of light.

Question

Quizplus · Accepted Answer

If the density of the universe is lower than the critical density, it implies that the gravitational pull is not strong enough to halt the expansion of the universe, leading to an expansion rate that is greater than the escape speed of the universe. This scenario is consistent with a universe that will continue to expand indefinitely.

If the Density of the Universe Is Lower Than the Critical