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planetary nebula

[天] 行星状星云

行星状星云(planetary nebula，PN)是质量小于8倍太阳质量的恒星演化到生命晚期，逐渐膨胀成红巨星阶段时，外层大气物质向太空逐渐扩张的结果，通常呈现同心圆状...

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短语

bipolar planetary nebula 双极行星状星云 ; 行星状星云

proto-planetary nebula 原行星状星云 ; 原始行星状星云

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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

1.
N an expanding shell of gas surrounding a dying star, formed from matter ejected from the star's outer layers; the gas is ionized by the remaining hot stellar core, emitting light in the process 行星状星云

See photos of new planetary nebula.

查看新的关于行星云团的照片。

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The Eskimo nebula is clearly a planetary nebula.

爱斯基摩星云显然是一个行星星云。

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Our own sun will blossom into a planetary nebula when it dies in about five billion years.

大约50亿年后，我们的太阳死去时，也会变成行星状星云。

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