英语词汇“planetary nebula”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	planetary nebula
释义	planetary nebula noun Astronomy A ring-shaped nebula formed by an expanding shell of gas round an ageing star.Astronomers call such an object a planetary nebula, because its round shape resembles that of a planet when viewed with a small telescope.... The Boomerang Nebula is a young planetary nebula and the coldest object found in the Universe so far. Until recently, it was thought that shells around planetary nebulae were a rare phenomenon.
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