Messier 31

Messier 31, or the Andromeda Galaxy, is the nearest spiral galaxy to our Milky Way. The distance is 2.5 million light-years and contains about one trillion stars (2 to 3 times more stars then our Milky Way).

Image details:
Telescope: TS 90/600 triplet with 2.5" TS flattener
Mount: Skywatcher AZ-EQ-GT
Camera: Atik one 6.0
Exposure: 75 * 300sec with Baader L filter, 25 * 300sec RGB, 17 * 300sec Ha Baader 7nm
Software: PixInsight, PS
Calibrationfiles: Dark:No, Bias:Yes (masterbias), Flat:Yes

(c) All photos by Ruud de Vries