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njh542 | profile | all galleries >> ap900_images >> wildlife >> astrophotograpy >> ap900_images >> narrow_band >> crescent_nebula tree view | thumbnails | slideshow
The Crescent Nebula (NGC 6888 or Caldwell 27) is an emission nebula in the Cygnus constellation, 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: http://en.wikipedia.org/wiki/Crescent_Nebula

The Crescent Nebula (NGC 6888) in H alpha
The Crescent Nebula (NGC 6888) in H alpha		 The Crescent Nebula (NGC 6888) in BIcolor
The Crescent Nebula (NGC 6888) in BIcolor		 The Crescent Nebula - processed using tonemapping
The Crescent Nebula - processed using tonemapping

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