Glossary:Cosmic Radiation

Official Name: Cosmic Radiation

Characteristics
Cosmic Radiation can be loosely defined as radiation consisting of energetic particles originating outside of the Earth. Cosmic rays are composed mainly of ionized nuclei, roughly 90% protons, 9% helium nuclei with most of the remainder made up of heavier nuclei. Electrons, gamma rays, and very high energy neutrinos also make up a much smaller fraction of cosmic radiation.

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