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Photographer:

Juan Ignacio Jimenez

Email:

jijc76@gmail.com

Location of Photo:

Villanueva de la Torre (Guadalajara, Spain)

Date/Time of photo:

12/02/2015

Equipment:

TS127/950 + QHY9M EZG60 + QHY5L-II AZ-EQ6 by HAS

Description:

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.[2] It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000[3] to 400,000[citation needed] 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.

Website:

http://www.astrohenares.org

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