Dumbbell Nebula is a planetary nebule i.e. remains of a dying star. The red color is hydrogen gas clouds, and the greenish blue color consists of nitrogen and oxygen as well. This nebula is about 1360 light years away and is about a light year wide.
Took this image over 10.5 hours (Luminance 39 images of 10 minutes each & 8 RGB images each of 10 minutes).