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The Crescent Nebula NGC6888 is an expanding shell of hydrogen gas measuring 16x25 light years across and illuminated by the Wolf-Rayet star at it's centre 30 x 5 min subs taken with modded Canon 450d on Skywatcher M-N 190 F5.3/EQ6, with Astronomic UHC Filter guided by PHD using IKI 80mm F7 Achromatic Guidescope and QHY5 camera, stacked in DSS / processed in Photoshop CS. [Ian Smith}