The source of the hot, intergalactic gas in many rich, regular clusters of galaxies appears to be
A) jets of gas ejected by supermassive black holes at the centers of the galaxies.
B) bursts of star formation in merging galaxies.
C) exploding stars or supernovae within individual galaxies.
D) collisions between galaxies in the cluster.

Question

Quizplus · Accepted Answer

The hot, intergalactic gas in rich, regular clusters of galaxies is primarily due to the gravitational interactions and collisions between galaxies within the cluster, which heat the gas to high temperatures.

The Source of the Hot, Intergalactic Gas in Many Rich