- 1. n. highly penetrating ionizing radiation of extraterrestrial origin; consisting chiefly of protons and alpha particles; collision with atmospheric particles results in rays and particles of many kinds Source: wordnet
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cosmic ray
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particlesalphaatmosphericchieflycollisionconsistingextraterrestrialhighlyionizingkindsoriginpenetratingprotonsradiationraysresults
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cosmiccosmic background radiationcosmic dustcosmic microwave backgroundcosmic microwave background radiationcosmic radiationcosmic stringcosmic time
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