View source for Primary Cosmic Ray

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'''Primary Cosmic Ray'''
 
</dt><BR/>High-energy [[Particles|particles]] 
originating outside the earth's [[Atmosphere|atmosphere]]. 
</dd><BR/>''Primary cosmic rays appear to come from all directions in space. Their 
energy appears to range from 10E9 to more than 10E17 electron volts. ''[[/a>|/a>
]]
==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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