How does the measured mass density of matter in the universe, including the hypothesized dark matter, compare to the critical density required to just close the universe?
A)The measured density is about 5 times the critical density.
B)The measured density is equal to the critical density to within the measurement uncertainty.
C)The measured density is less than 0.1 of the critical density.
D)The measured density is between 0.2 and 0.4 of the critical density.

Question

Quizplus · Accepted Answer

The measured mass density of matter in the universe, including the hypothesized dark matter, is estimated to be between 0.2 and 0.4 times the critical density required to just close the universe. This means that the universe is open, and will continue to expand indefinitely.

How Does the Measured Mass Density of Matter in the Universe