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

Question

Quizplus · Accepted Answer

A rich cluster of galaxies is a cluster that contains thousands of galaxies. These clusters are the largest and most massive structures in the universe, held together by the gravitational attraction between their constituent galaxies. Rich clusters are typically dominated by elliptical galaxies and are important for studying the evolution of galaxies and the large-scale structure of the universe.

What Is a Rich Cluster of Galaxies