All of the following observations are real.Which one does not support the theory that active galactic nuclei are powered by accretion disks around massive black holes?
A)X-ray emission from active galactic nuclei can vary significantly in times as short as a few days.
B)The total luminosity of an active galactic nucleus can be as high as about 10 billion times that of the Sun.
C)Spectra of active galactic nuclei show that clouds of gas are orbiting a central object at very high speed.
D)The most luminous active galactic nuclei have huge redshifts.

Question

Quizplus · Accepted Answer

The observation that the most luminous active galactic nuclei have huge redshifts does not directly support the theory that active galactic nuclei are powered by accretion disks around massive black holes. Redshift is a phenomenon caused by the expansion of the universe and the motion of objects away from our perspective. While it is true that some active galactic nuclei show redshift, it is not a necessary or sufficient condition for the presence of an accretion disk or a massive black hole.

All of the Following Observations Are Real