Exposures: 120 min Ha and 30 min each RGB for a total of 3.5 hrs.
NGC 6888 also known as the Crescent Nebula is formed by the fast stellar winds from a Wolf-Rayet star colliding with and energizing the slower moving wind ejected by the same star when it evolved to a red giant 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. Discovered by Friedrich Wilhelm Herschel in 1792.
5000 light years away
Field of View = 52 x 35 arc minutes
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