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LRGB image of the Crescent Nebula NGC6888. Taken on the 8SE scope All controlled by APTsoftware

The Crescent Nebula 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 colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 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.

 
 
2016-08-09 22:40:06       
Wow I must confess you make some very trahncent points.
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