Dictionary

cosmic ray

noun

: a stream of energy that enters the Earth's atmosphere from outer space

Full Definition of COSMIC RAY

:  a stream of atomic nuclei of extremely penetrating character that enter the earth's atmosphere from outer space at speeds approaching that of light
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First Known Use of COSMIC RAY

1925

Rhymes with COSMIC RAY

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COSMIC RAY Defined for Kids

cosmic ray

noun

Definition of COSMIC RAY for Kids

:  a stream of very penetrating particles that enter the earth's atmosphere from outer space at high speed

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3 ENTRIES FOUND:
Next Word in the Dictionary: cosmic–ray showerPrevious Word in the Dictionary: cosmic radiationAll Words Near: cosmic ray
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