What condition is necessary for the universe to be unbounded (infinite in extent)?
A)The density of the universe must be equal to or less than some critical value.
B)The density of the universe must be equal to or greater than some critical value.
C)The universe must have no mass in it.
D)The density of the universe must be exactly equal to some critical value.

Question

Quizplus · Accepted Answer

If the density of the universe is equal to or less than some critical value, the universe is expanding at a rate that is greater than or equal to the escape velocity, which means it is unbounded and infinite in extent. If the density is greater than this critical value, the universe would eventually collapse in on itself due to its own gravity, making it bounded and of finite extent.

What Condition Is Necessary for the Universe to Be Unbounded