HyperDic: cosmic_ray

English > 1 sense of the expression cosmic ray:
NOUNphenomenoncosmic rayhighly penetrating ionizing radiation of extraterrestrial origin
English > cosmic ray: 1 sense > noun 1, phenomenon
MeaningHighly 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.
Part ofcosmic radiationRadiation coming from outside the solar system
Broaderionizing radiationhigh-energy radiation capable of producing ionization in substances through which it passes

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