"Horsehead Nebula" (also known as "Barnard 33" in emission nebula "IC 434") is a dark nebula in the constellation Orion. The image is a frame mosaic taken with 5 different filters, standard Red – Green – Blue with details enhanced with narrowband data of Hydrogen-alpha (Hα) and O III. The Hα was color-mapped to red and the O III to teal. So it is a representative color image consisting of over 900 minutes of exposure time.