| 单词 | giant planets |
| 释义 | giant planetsgiant planetsThe planets Jupiter, Saturn, Uranus, and Neptune, which have diameters between 3.9 and 11.2 times that of the Earth and masses of between 14 and 318 Earth masses. They orbit the Sun at mean distances ranging from 5.21 AU for Jupiter to 30.06 AU for Neptune in periods from 11.86 to 164.79 years. All have low densities – from 0.7 to 1.8 times that of water – and are probably composed largely of hydrogen in its molecular or metallic state. Their visible surfaces are thought to be clouds of ammonia or methane. They all have planetary ring systems and share at least 150 satellites between them (see Table 2, backmatter).giant planets[¦jī·ənt ′plan·əts] |
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