In Active Galaxies, Their Central Engines May Be Temporarily Fed

question 99

Multiple Choice

In active galaxies, their central engines may be temporarily fed by

• A) a close encounter with a neighbor galaxy.
• B) a sudden surge of star formation.
• C) the sudden collapse of the core into a supermassive black hole.
• D) the fusion of helium into carbon in their cores.
• E) a series of supernovae around the core.

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