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M101 the Pinwheel Galaxy is 21 Million LY away in Ursa Major.At 170K LY across it is much bigger than the Milky Way.It has many bright H11 regions, large low-density clouds of partially ionised gas in which star formation has recently taken place.

Imaged with Atik 460EX on M-N 190 F5.3.Two hours of Lum and 30 mins each of RGB on NEQ6,guided by PHD/QHY5 camera, stacked in DSS and processed in Photoshop CS5
[Ian Smith]