Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around supermassive black holes?
A)Observed radiation from the galactic center varies significantly in brightness in times as short as a few days.
B)Infrared observations show that many stars are forming near the centers of active galaxies.
C)Radio observations sometimes show long jets of material extending millions of light-years out from the galactic center.
D)The total amount of radiation coming from the galactic center is,in some cases,comparable to the amount of radiation put out by 10 billion or more ordinary stars.
E)Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed.

Question

Quizplus · Accepted Answer

The formation of stars near the centers of active galaxies does not necessarily provide evidence for the presence of supermassive black holes and accretion disks. The other options all provide evidence such as the variability of radiation, long jets of material, total amount of radiation, and high-speed orbiting gas clouds, which are consistent with the existence of accretion disks around supermassive black holes powering active galactic nuclei.

Which of the Following Is Not a Piece of Evidence