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The '''Crescent nebula''' ([[NGC]]&nbsp;6888, Sharpless&nbsp;105, Caldwell&nbsp;27) is an [[emission nebula]] situated in the [[constellation]] of [[Cygnus]], the [[swan]].<ref name=apod/> The nebula consists of a central [[Wolf-Rayet star]], designated WR&nbsp;136, enveloped by a bubble of [[gas]] that is 25 ly wide.<ref name=apod/> The central star is thought to have a mass of 25-40 [[solar masses]] and ejected the gas that surrounds it to form the nebula through strong [[stellar wind]]s.<ref>

The '''Crescent nebula''' ([[NGC]]&nbsp;6888, Sharpless&nbsp;105, Caldwell&nbsp;27) is an [[emission nebula]] situated in the [[constellation]] of [[Cygnus]], the [[swan]].<ref name=apod/> The nebula consists of a central [[Wolf-Rayet star]], designated WR&nbsp;136, enveloped by a bubble of [[gas]] that is 25 ly wide.<ref name=apod/> The central star is thought to have a mass of 25-40 [[solar mass]]es and ejected the gas that surrounds it to form the nebula through strong [[stellar wind]]s.<ref>

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  |last1=Esteban |first1=C.