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来自维基百科，自由的百科全书
眉月星雲（ Crescent Nebula）也稱為NGC 6888或Caldwell 27，距離大約5,000光年，是位在天鵝座的發射星雲。它由來自沃爾夫-拉葉星WR 136快速的恆星風，與它在40萬年前仍是紅巨星時吹出的慢速恆星風氣體碰撞與擠壓造成的。碰撞的結果形成殼狀並產生二股震波，一股向內移動，另一股向外移動。向內移動的震波使恆星風被加熱而輻射出X射線。
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