| 单词 | comet |
| 释义 | comet A small body that travels around the sun in an eccentric orbit. Short-period comets have orbital periods of less than 150 years. The others have very long periods, some exceeding 100 000 years. Typical comets have three components: the nucleus of ice and dust, the coma of gas and dust, and the comet tail , which only appears when the comet is near the sun (it, too, consists of gas and dust). The nuclei of most comets are thought to be ‘dirty snowballs’ about one kilometre in diameter, although the solar system has a few comets with nuclei exceeding 10 km in diameter. The coma may be 104–105 km in diameter, and the tail can be 107 km in length. See also Halley's comet |
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