| NOUN | phenomenon | cosmic ray | highly penetrating ionizing radiation of extraterrestrial origin |
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| Meaning | 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. | |
|---|---|---|
| Part of | cosmic radiation | Radiation coming from outside the solar system |
| Broader | ionizing radiation | high-energy radiation capable of producing ionization in substances through which it passes |
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