Imagine the Universe!
Imagine Home | Science |

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.

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

DVD Table of Contents
Educator's Index