| 单词 | Oort cloud |
| 释义 | Oort cloud /awrt, ohrt/, Astron. a region of the solar system far beyond the orbit of Pluto in which billions of comets move in nearly circular orbits unless one is pulled into a highly eccentric elliptical orbit by a passing star. [1975-80; after Dutch astronomer Jan Hendrik Oort (1900-1992), who proposed its existence] |
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