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Cosmic ray   /kˈɑzmɪk reɪ/   Listen
Cosmic ray

noun
1.
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.





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"Cosmic ray" Quotes from Famous Books



... this have to do with cosmic ray particle? Well, if that atomic bomb had been moving at the velocity with which our ten-to-the-nineteenth-electron-volts proton is moving, it could have been made of sand instead of U^235. It would have produced ten thousand million times ...
— Hanging by a Thread • Gordon Randall Garrett


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