A rich, regular cluster of galaxies differs from a rich, irregular cluster in that
A) its galaxies are distributed in a regular, highly flattened system (like a disk).
B) it contains fewer galaxies than does an irregular cluster.
C) it lacks the giant elliptical galaxies often found in irregular clusters.
D) it has fewer spirals and more ellipticals and S0 galaxies than an irregular cluster.

Question

Quizplus · Accepted Answer

Rich, regular clusters of galaxies tend to have a higher concentration of elliptical and S0 galaxies and fewer spiral galaxies compared to rich, irregular clusters. This is due to the dense environment of regular clusters, which is conducive to the transformation of spiral galaxies into ellipticals and S0s through processes such as galaxy mergers and interactions.

A Rich, Regular Cluster of Galaxies Differs from a Rich