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Cosmic Ray Cool Fact

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!


A service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/GSFC

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