Larger version here: http://imgur.com/8b5UZPE
The Orion Nebula (M42) is a massive star forming region in the constellation Orion. Pictured here is the main core of the nebula and some of the outer gas and dust. All the colors you see in the picture are real and were captured by the camera.
This photo was taken from Yosemite Natl. Park, and represents about 3 hours of shooting, and 15 hours of post processing.
For those who care:
Orion Sirius mount
Nikon 80-400mm f/5.6 @ 400mm
60 darks for each set
Processed in DSS, Pixinsight, Adobe Lighroom, and Photoshop cs2.