oort cloud | | |
n. (group) | 1. oort cloud | (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. |
| ~ astronomy, uranology | the branch of physics that studies celestial bodies and the universe as a whole. |
| ~ aggregation, collection, accumulation, assemblage | several things grouped together or considered as a whole. |
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