oort : Idioms & Phrases
Index
jan hendrix oort
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noun Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)
Oort.
WordNet
oort cloud
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noun (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