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planetary nebula

  • 行星状星云:一种通常紧凑、呈环状的发光星云,由位于中心的炽热恒星喷射出的物质组成。

网络释义英英释义

  行星状星云

... 要一颗颗地单独观察M87中的恒星是非常不现实的,它们数量太多,也太暗了。于是,研究团队只搜寻行星状星云planetary nebulae)作为研究对象,它们其实是包裹在年老恒星外部的膨胀气体层。

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短语

List of planetary nebulae 行星状星云列表

planetary nebula

  • 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

以上来源于: WordNet

双语例句

  • L the Ring nebula in Lyra is the best-known of the planetary nebulae.

    l天琴座中的环状星云著名行星状星云。

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  • Planetary nebulae fade away gradually over tens of thousands of years.

    行星星云数万年间逐渐衰老。

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  • Stars that form planetary nebulae typically live for billions of years.

    具有代表性是,构成行星星云恒星已经存活了十亿

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