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Oort cloud

nuage d’Oort

Oort Cloud properNoun

  /ˈɔːrt klaʊd/
  • (astronomy) The Solar System's Oort cloud, extending from 50,000 to 100,000 astronomical units (approximately 1 light year) from the sun; supposedly the source of most comets around the Solar System.
 nuage de Oort
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