Which of the Following Is Not a Piece of Evidence

question 121

Multiple Choice

Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around massive black holes?

• A) Observed radiation from the galactic center can vary 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 that can extend millions of light-years out from the galactic center.
• D) The total amount of radiation coming from the galactic center can, in some cases, exceed 100 times the total luminosity of the Milky Way Galaxy.
• E) Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed.

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Definitions:

Red Giants

A phase in the life cycle of a star where it expands and cools after exhausting the hydrogen in its core, typically marked by a significant increase in size and a change in color to red.

White Dwarfs

are small, dense stars that represent the final evolutionary state of stars not massive enough to become neutron stars or black holes.

Dynamic

Pertains to the continuous change, activity, or progress within a process or system.

Evolving Spheres

Domains or areas that are continually changing or developing over time.