http://horizonastro.blogspot.com/2010/12/les-granges-2010.html
Formed by the fast stellar wind from a Wolf-Rayet star (massive stars, 20x the solar mass which lose mass rapidly) colliding with and energizing the slower moving wind ejected by the star when it became a red giant about 400,000 years ago. It's an emission nebula located in the constellation Cygnus.
Object: NGC 6888 - The Crescent Nebula (5,000ly)
Telescope: TEC140
Camera: Atik 4000 Mono
Exposures: R-12x300s; G-12x300s; B-12x300s; Ha-16x600s; OIII-24x600s
Processing: DSS, PS CS3
Processed as R(Ha)G(OIII)B(OIII), all added at 50% blend mode lighten.
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