The Most Active Galactic Nuclei Are Usually Found at Large

question 53

Multiple Choice

The most active galactic nuclei are usually found at large distances from us;relatively few nearby galaxies have active galactic nuclei.What does this imply?

• A)Supermassive 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.