The Andromeda Galaxy (M31)

Our sister galaxy is about 2.5 million light years away from earth and is home to about a trillion stars.

 

Image taken from my backyard in Luxembourg with an Explore Scientific 127/952@666mm apo and an ATIK383l+ CCD camera.

 

Exposure: 20*600s Luminance, 10*300s bin2x2 RGB (each), 8*900s h-alpha.

 

Done