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planetary nebula
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https://www.zzcmix.top/dict/planetary_nebula
复制链接 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。
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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
网络释义
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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