Astro Imaging & Dark Sky Preserve
-The Crescent Nebula (also known as NGC 6888. Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light years away. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with an energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 4000,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-Ray-emitting temperatures.
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