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来自维基百科，自由的百科全书
眉月星云（ Crescent Nebula）也称为NGC 6888或Caldwell 27，距离大约5,000光年，是位在天鹅座的发射星云。它由来自沃尔夫-拉叶星WR 136快速的恒星风，与它在40万年前仍是红巨星时吹出的慢速恒星风气体碰撞与挤压造成的。碰撞的结果形成壳状并产生二股震波，一股向内移动，另一股向外移动。向内移动的震波使恒星风被加热而辐射出X射线。
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