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Image is Crescent Nebula ngc6888 an emission nebula in Cygnus 5K LY away formed by fast stellar wind from the Wolf-Rayet star colliding with and energising the slower moving wind ejected by the star when it became a red giant around 250K years ago.This produces 2 shock waves, one moving outwards and one inwards which heats the stellar wind to X-ray emitting temperatures..

3hrs of Ha(Red) and 2 hrs O3(blue) produced a Narrowband bicolour image using 190mm Mak-Newt/Atik 460e on an NEQ6 with Maxim/PHD2/DSS/PS software. [Ian Smith]