By Examining Rich Clusters of Galaxies, Such as the Coma

Multiple Choice

By examining rich clusters of galaxies, such as the Coma Clusters, astronomers have discovered that spiral galaxies

A) grow to be very large and bright at the centers of these clusters
B) turn out to be most of the galaxies in such clusters, and many are found throughout each cluster
C) do not exist at all in such clusters
D) are found mostly in the outer regions of such clusters, not in the middle
E) are all tilted exactly the same way in such cluster; all their disks are fully aligned