What is a rich cluster of galaxies?
A) cluster with more spiral galaxies than ellipticals
B) cluster (like the Local Group) that contains at least two large galaxies
C) cluster with a high metal content
D) cluster containing thousands of galaxies

Question

Quizplus · Accepted Answer

Rich clusters of galaxies are characterized by containing thousands of galaxies, distinguishing them from smaller groups or clusters with fewer members.

What Is a Rich Cluster of Galaxies