Oort cloud

noun \ˈȯrt-\

Definition of Oort cloud

  1. :  a spherical shell of cometary bodies believed to surround the sun far beyond the orbits of the outermost planets and from which some are dislodged when perturbed to fall toward the sun — compare kuiper belt

Origin and Etymology of oort cloud

Jan Oort †1992 Dutch astronomer

First Known Use: 1974

Seen and Heard

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a dividing ridge between drainage areas

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