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Active Galaxies Quiz

  1. What kind of object is believed to be in the center of an active galaxy?


  2. What features did Carl Seyfert observe in NGC 4151?



  3. It is possible to have a 109 solar-mass black hole.


  4. What produces the phenomena observed in AGN?


  5. What is the source of many of the apparent differences in the types of AGN we observe?


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Imagine the Universe! is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

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This page last updated: Wednesday, 15-Sep-2004 11:44:22 EDT