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Cosmic ray

noun

Definitions

Noun
  1. 1
    Any of a range of subatomic particles, and thus also electromagnetic waves, that permeate the universe owing to their various origins within stars or from collisions outside stars. (Life on Earth is mostly shielded from them by the Earth's magnetic field, but a small amount strikes us all each day.)

    "Holonym: radiation"

  2. 2
    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 wordnet

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