A radio galaxy whose lobes are swept back as if forming a tail.This probably indicates that:
A) this is evidence for intergalactic matter.
B) the galaxy is about to evolve into a spiral.
C) the galaxy is isolated, not part of a cluster.
D) the galaxy is moving towards Earth.
E) there must be another galaxy nearby.

Question

Quizplus · Accepted Answer

The lobes being swept back as if forming a tail is indicative of intergalactic matter, which is likely causing resistance and pushing the lobes back. This is often seen in radio galaxies that are located near or within galaxy clusters.

A Radio Galaxy Whose Lobes Are Swept Back as If