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Crescent nebula

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 from Ear...
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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 from Earth. 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. This image is the result of more than 34 Hours exposure.
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Absolute Masterpiece
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2 Comments | Report
RosChalcraft
 
RosChalcraft March 31, 2015
amazing!!
Saltydog
 
Saltydog December 30, 2016
Love the feel of your work overall. You have a great eye for detail, composition and colour which is similar to the way i look at my photos. Thank you for sharing