oort cloud

Noun
  1. (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto;
    Perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun (synset 108287583)
    referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: accumulation, aggregation, assemblage, collection - several things grouped together or considered as a whole

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