Cosmic Ray Definition

noun
A very rapidly moving particle of extraterrestrial origin, especially one that collides with the earth's atmosphere. Cosmic rays are mainly protons and alpha particles but sometimes are other light atomic nuclei and high-energy electrons.
American Heritage

An energetic particle originating outside our solar system.

Wiktionary

Other Word Forms of Cosmic Ray

Noun

Singular:
cosmic ray
Plural:
cosmic rays

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cosmic ray