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Oort cloud

Syllabification: Oort cloud
Astronomy

Definition of Oort cloud in English:

A spherical cloud of small rocky and icy bodies postulated to orbit the sun beyond the orbit of Pluto and up to 1.5 light years from the sun, and to be the source of comets. Its existence was proposed by J. H. Oort.

Definition of Oort cloud in:

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