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[[File:Mt. Sulphur cosmic ray observatory.jpg|thumb|right|Mt. Sulphur cosmic ray observatory]]
'''Cosmic rays''' are extremely high-energy [[radiation]], mainly originating outside the [[Solar System]].<ref>{{cite book
'''Cosmic rays''' are extremely high-energy [[radiation]], mainly originating outside the [[Solar System]].<ref>{{cite book
| last=Sharma
| last=Sharma