“planetary nebula”的概念、定义、翻译、参考文献-科学参考

单词	planetary nebula
释义	planetary nebula Encyclopedia 理学行星状星云释 planetary nebula行星状星云其中心有一向白矮星过渡的热星，且由稀薄电离气体组成有明晰边缘的小圆面状星云。星云为该中心星所抛出，正向外膨胀，并由中心星的紫外辐射照射而发光。 Physics 交叉学科天体物理学 planetary nebula行星状星云 Astronomy planetary nebula缩写：PN。行星状星云
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