Based on galactic rotation curves and cluster dynamics, we think dark matter
A) comprises over 90% of the entire mass of the universe.
B) is best detected from the X- rays it produces in the intergalactic medium.
C) is a minor component of the entire mass of the universe.
D) will doom the universe to collapse, overcoming the redshifts we now observe.
E) will have no effect on the fate of the universe.

Question

Quizplus · Accepted Answer

Dark matter is believed to make up about 85% of the universe's mass, not over 90%, but it is still the correct choice as it indicates dark matter comprises a significant portion of the universe's mass. The other options are incorrect: dark matter does not primarily produce X-rays for detection, it is not a minor component, it does not doom the universe to collapse, and it does have gravitational effects that influence the universe's structure and evolution.

Based on Galactic Rotation Curves and Cluster Dynamics, We Think