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NGC 6888 (also known as Crescent Nebula) is a diffuse nebula visible in the southern part of the Swan constellation.
The cloud shines with reflection, following the energy received during the explosion of a supernova.
Within a few millennia, the object is expected to vanish completely, dispersing in the interstellar medium. The nebula gas appears to be centered on a Wolf-Rayet star (HD 192163), which is now inside it; this star would also be responsible for the nebula, which would constitute the material of the outer layers of the expelled star, which would then collide with other nebulae thus creating the shape we currently observe.
