Based on Galactic Rotation Curves and Cluster Dynamics, We Think

Multiple Choice

Based on galactic rotation curves and cluster dynamics, we think dark matter:

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