When Astronomers Have Examined Rich Clusters of Galaxies with Their

Multiple Choice

When astronomers have examined rich clusters of galaxies with their instruments, they have found that these clusters

A) contain far more spiral galaxies in their central regions than elliptical galaxies
B) are more likely to contain giant elliptical galaxies than poor clusters
C) are the only places in the universe where galaxies find a way NOT to collide
D) contain mostly galaxies dominated by the light of young stars (stars formed recently)
E) are so big that there is a lot more space between the galaxies than in poor clusters like our Local Group