Which of the Following Is NOT a Way in Which

Multiple Choice

Which of the following is NOT a way in which astronomers detect dark matter in clusters of galaxies?

A) by determining the amount of mass necessary to gravitationally collapse clouds of gas to form the number of stars present
B) by determining the amount of mass necessary to gravitationally hold onto the hot gas surrounding galaxy clusters
C) by determining the amount of mass necessary to gravitationally hold a cluster of galaxies together
D) by determining the amount of mass necessary to gravitationally lens images of distant objects
E) None of the above; all of these are ways that astronomers detect dark matter in galaxy clusters.