Which of the following statements is typically true of galaxy clusters?
A) Most of their galaxies are large and bright.
B) The fraction of spiral galaxies increases toward the outskirts of clusters.
C) The pressure of their hot intracluster medium supports the galaxies against falling toward the center.
D) Most of their galaxies have ongoing star formation.

Question

Quizplus · Accepted Answer

Galaxy clusters often have a higher fraction of elliptical and lenticular galaxies towards their centers, with spiral galaxies becoming more common towards the outskirts. This is due to the dense environment in the center of clusters, which can strip gas from galaxies and inhibit star formation, making spiral galaxies less common in those regions.

Which of the Following Statements Is Typically True of Galaxy