By examining rich clusters of galaxies, such as the Coma Clusters, astronomers have discovered that spiral galaxies
A) grow to be very large and bright at the centers of these clusters
B) turn out to be most of the galaxies in such clusters, and many are found throughout each cluster
C) do not exist at all in such clusters
D) are found mostly in the outer regions of such clusters, not in the middle
E) are all tilted exactly the same way in such cluster; all their disks are fully aligned

Question

Quizplus · Accepted Answer

Spiral galaxies are more commonly found in the outer regions of galaxy clusters, including rich clusters like the Coma Cluster. This is because the dense central regions of these clusters are more hostile to the spiral structure due to gravitational interactions and higher temperatures, which can strip gas from galaxies and prevent the formation of new stars, thus affecting the spiral structure.

By Examining Rich Clusters of Galaxies, Such as the Coma