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Ebenwaldhöhe, 2. August 2008, 23:40
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When the star WR 136 became a red supergiant around 400,000 years ago, it ejected huge amounts of gas. Today, WR 136 is energizing the gas, producing a fast stellar wind which forms the so called Crescent Nebula, or NGC 6888, or Caldwell 27 in the Cygnus constellation. This emission nebula, at a distance of about 5000 light years from Earth, depicts two shock waves, one moving outward and one moving inward. |
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| | Instrument: | Pentax 75 SDHF | | | Camera: | Atik 16HR | | | Mount: | Vixen GP-DX | | | Exposure: | Ha 7x10min, O3 7x10min, S2 8x10min | | | Conditions: | +15 °C, mag 6+ sky, no wind | | | Image Processing: | Iris, Fitswork, Photoshop, Red = Ha, Green = 70% O3 + 30% S2 , Blue = O3 |
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