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Oort cloud
DEFINITIONS OF:
Oort cloud
1
n
(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
Type of:
accumulation
,
aggregation
,
assemblage
,
collection
several things grouped together or considered as a whole
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