Question

What are Cosmic Rays?

Answer 1

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Cosmic rays are high-energy protons and atomic nuclei which move through space at nearly the speed of light. They originate from the sun, from outside of the solar system, and from distant galaxies. They were discovered by Victor Hess in 1912 in balloon experiments.

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Answer 2

Cosmic rays are energetic, subatomic particles that arrive from outside the Earth's atmosphere.