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Cosmic Rays Quiz

  1. The average age of cosmic rays is:

  2. The most common element in cosmic rays is:

  3. The composition of the solar system is determined with:

  4. Cosmic rays can produce gamma rays when they interact with:

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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