The factor needed to find out if the universe expands forever or recollapses is the ____.
A) critical density
B) supernova 1a
C) nuclear constant
D) gravitational constant

Question

Quizplus · Accepted Answer

The critical density of the universe determines whether it will expand forever or eventually recollapse. If the actual density is greater than the critical density, the gravitational attraction will eventually stop the expansion and cause the universe to recollapse. If the actual density is less than the critical density, the universe will expand forever.

The Factor Needed to Find Out If the Universe Expands