1/29/2015 5:41:33 PM
This image of the region just south of Alnitak, the most eastern star in Orion's Belt, shows three different kinds of nebulae. The Horsehead Nebula (Barnard 33) in the center is a dark nebula. NGC 2023 is the blue reflection nebula just to the left of the Horsehead's base. The Flame Nebula (NGC 2024) at the left of the image is an emission nebula. This is an HaRGB image taken at a focal length of 620 mm.