A preponderance of evidence suggests that an active galaxy consists of a
A) large H II region.
B) supermassive black hole onto which matter accretes.
C) large H I region.
D) supernova remnant.

Question

Quizplus · Accepted Answer

An active galaxy is powered by a supermassive black hole onto which matter accretes, causing it to emit large amounts of radiation across multiple wavelengths. This radiation can come from a variety of sources, including the accretion disk surrounding the black hole, as well as outflows and jets of material that are accelerated to high speeds as they leave the vicinity of the black hole. While the other options listed may be present in active galaxies, they are not the primary feature that defines them.

A Preponderance of Evidence Suggests That an Active Galaxy Consists