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Cosmic Rays

The very highest energy cosmic rays are so rare that a one square kilometer area on the Earth gets hit by them less than one time per century! You need a really big detector to measure very many of these events!

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.

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