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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:

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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.

The Imagine Team
Project Leader: Dr. Barbara Mattson
Curator: Meredith Gibb
Responsible NASA Official: Phil Newman
All material on this site has been created and updated between 1997-2014.
This page last updated: Wednesday, 15-Sep-2004 11:44:22 EDT