Oort cloud 
(ôrt)
(ôrt)n.
A swarm of comets orbiting the sun at a distance of one to two light-years, proposed as a source of comets that pass near the sun.
[After Jan Hendrix Oort (1900-1992), Dutch astronomer.]
| 单词 | Oort cloud |
| 释义 | Oort cloud (ôrt)n. A swarm of comets orbiting the sun at a distance of one to two light-years, proposed as a source of comets that pass near the sun. [After Jan Hendrix Oort (1900-1992), Dutch astronomer.] |
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