The Pinwheel Galaxy (M101)
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ASI2600MM 3x12x300s RGB, 54x180s Lum, 12x900s Ha (10.9h)
The Pinwheel Galaxy M101 with a diameter of about 170.000 lightyears is only a little smaller in size than Andromeda, but at a distance of about 16 million lightyears it is much smaller in our sky.
The overdone red areas of glowing Hydrogen may form new stars over a long period of time.