Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa nebula.

象辫子一样层层卷绕的发光丝状气体暗示了这个星云的俗名：水母(美杜萨)星云。

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Also known as Abell 21, this Medusa is an old planetary nebula some 1, 500 light-years away in the constellation Gemini.

也被称作阿贝尔21，水母星云是双子座中一个1500光年远的年老行星状星云。

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Also known as Abell 21, this Medusa is an old planetary nebula some 1, 500 light-years away in the constellation Gemini.

也被称作阿贝尔21，水母星云是双子座中一个1500光年远的年老行星状星云。

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