M31

M31 (click on image to enlarge)
Taken 11-3,29-13
17exps1x1300s-22CLum
15exps1x160s-22CLum
6exps2x2300s-22CRGB
AT111edt,st8300
Neb3,CCDstk,CS4
For more info
http://en.wikipedia.org/wiki/Andromeda_Galaxy