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) 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.