What happens to active galaxies when their AGNs run out of fuel?
A) The black holes powering them collapse even further.
B) They simply become normal galaxies.
C) They slowly dissipate into clouds of gas and dust.
D) They eventually pull in material from farther out,starting the AGN process all over again.

Question

Quizplus · Accepted Answer

When an active galaxy's AGN runs out of fuel, it simply becomes a normal galaxy. The black hole at the center may still be present, but it is no longer actively feeding on material and powering the AGN. The galaxy will no longer have the high levels of activity and radiation associated with an active galaxy.

What Happens to Active Galaxies When Their AGNs Run Out