cosmic ray
English Thesaurus
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 (noun.phenomenon)
| hypernym | : | ionizing radiation, |
| definition | : | high-energy radiation capable of producing ionization in substances through which it passes (noun.phenomenon) |
| part meronym | : | cosmic radiation, |
| definition | : | radiation coming from outside the solar system (noun.phenomenon) |
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