The critical density of the universe is approximately equal to:
A) 1 proton/m3.
B) 1 kg/m3.
C) 1 Earth mass/m3.
D) 1 solar mass/m3.

Name: The critical density of the universe is approximately equal to: A) 1 proton/m3. B) 1 kg/m3. C) 1 Earth mass/m3. D) 1 solar mass/m3.
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Question

Quizplus · Accepted Answer

The critical density of the universe is roughly equivalent to 1 proton per cubic meter, which is a very low density. This value is used in cosmology to determine whether the universe will expand forever or eventually collapse.

The Critical Density of the Universe Is Approximately Equal To