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Active Galaxies Quiz

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


  2. Seyfert galaxies emit gamma-rays up to energies of about:



  3. Gamma-ray quasars are the most powerful particle accelerators in the universe.


  4. Which two types of active galaxies emit gamma-rays?


  5. In "active" galaxies, the total energy emitted is the sum of the emission from each of the stars found in the galaxy.


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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Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.

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