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Crescent Nebula (NGC6888) 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 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 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. (Source: Wikipedia) Astro-Tech AT106LE, 106mm f/6.5 triplet Astro-Tech Field Flattener SBIG ST8300M w/FW5-8300 Baader 7nm Hydrogen Alpha Guided w/ Oriion ST80 & Starshoot Autoguider Celestron CGE Mount Lights: 12 X 5min exposures @ -5C 50 Darks No Flats Stacked in Deep Sky Stacker Processed with Photoshop CS5 Taken by: Tony Cellini Date: 6/9/2010 Exposure: 60 minutes (12 X 300 seconds)

Hubble Space Telescope image: Galaxy NGC 2397 with an explosive secret
 
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