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Oort cloud

Definition from Dictionary, a free dictionary
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Edward M. Forster
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English

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Etymology

Named after Jan Oort.

Proper noun

Singular
Oort cloud

Plural
-

Oort cloud

  1. (astronomy) A roughly spherical region of space from 50,000 to 100,000 astronomical units (approximately 1 light year) from the sun; supposedly the source of most comets.

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