| NOUN | group | Oort cloud | (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto |
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| Meaning | (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. | |
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| Category | astronomy, uranology | The branch of physics that studies celestial bodies and the universe as a whole |
| Broader | collection, aggregation, accumulation, assemblage | Several things grouped together or considered as a whole |
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