| 单词 | planetary nebula |
| 释义 | planetary nebula (once / 241211 pages) n WORD FAMILY planetary nebula: planetary nebulae USAGE EXAMPLES“It tells us, look: What shapes the planetary nebula is a binary system.” Science Magazine(Sep 16, 2016) Every planetary nebula is a token of a star in extremis. Carl Sagan, Cosmos(1980) This ghostly vision is a planetary nebula — the gently glowing remnants of a dying star. Nature(Dec 16, 2015) n a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star Hyper nebula an immense cloud of gas (mainly hydrogen) and dust in interstellar space |
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