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'''Cosmic rays''' are extremely high-energy [[radiation]], mainly originating outside the [[Solar System]].<ref>{{cite book
| last=Sharma
| title=Atomic And Nuclear Physics
| date=2008
| publisher=Pearson Education India
| isbn=978-81-317-1924-4
| page=478
}}</ref> Cosmic rays are composed primarily of high-energy [[proton]]s and [[atomic nuclei]]. They are of mysterious origin. They were given the name "rays" in the mistaken belief that they were a form of electromagnetic radiation. However, cosmic rays are particles rather than just photons. Due to relativistic effects, cosmic rays have a very high mass and reach energies of up to 10<sup>14</sup> eV.
==References==
<references/>
[[Category:Physics]]
| last=Sharma
| title=Atomic And Nuclear Physics
| date=2008
| publisher=Pearson Education India
| isbn=978-81-317-1924-4
| page=478
}}</ref> Cosmic rays are composed primarily of high-energy [[proton]]s and [[atomic nuclei]]. They are of mysterious origin. They were given the name "rays" in the mistaken belief that they were a form of electromagnetic radiation. However, cosmic rays are particles rather than just photons. Due to relativistic effects, cosmic rays have a very high mass and reach energies of up to 10<sup>14</sup> eV.
==References==
<references/>
[[Category:Physics]]