Most Active Galactic Nuclei Are at Large Distances from Us;

question 7

Multiple Choice

Most active galactic nuclei are at large distances from us; relatively few nearby galaxies harbor active galactic nuclei. What does this imply?

• A) Massive black holes existed only when the universe was young and no longer exist today.
• B) Active galactic nuclei tend to become less active as they age.
• C) Active galactic nuclei can form only at large distances from the Milky Way.
• D) The jets seen in many active galactic nuclei must cause them to move far away from us.

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