If the density of the universe is greater than critical, then:
A)there is more matter than energy.
B)the universe is closed, gravity wins, and will shrink to the Big Crunch.
C)the universe is flat, and Euclid is right.
D)the universe will continue expanding forever.
E)the universe will end up as nothing but black holes.

Question

Quizplus · Accepted Answer

If the density of the universe is greater than critical, then the universe is closed and gravity wins. This means that the gravitational force will eventually overcome the expansion of the universe and the universe will begin to shrink. Eventually, everything in the universe will collapse into a singularity known as the Big Crunch. If the density of the universe is greater than critical, it means that the curvature of space-time is positive, implying that the universe is closed. In such a scenario, the gravitational attraction between all matter is strong enough to overcome the expansion of the universe, leading to a collapse towards the Big Crunch.

If the Density of the Universe Is Greater Than Critical