Barnard's loop and constellation Orion - Barnard's loop and Orion constellation - The constellation Orion...

Barnard's loop and constellation Orion - Barnard's loop and Orion constellation - The constellation Orion and its nebulae. The main stars of this constellation are two supergeants, Betelgeuse (red) on the top left and Rigel (blue) on the bottom right. In the center of the constellation are the three stars forming Orion's Belt (or Baldrier) and the dark nebula of the horse's head (IC434 - B33). Further down, the large Orion nebula (M42) vast star-forming region. Wrapping these nebulae, Barnard's loop, a circle-arch nebula that would come from the explosion of a supernova more than two million years ago. The Orion constellation and its nebulae. The two Orion's bright stars are both supergiant stars: Betelgeuse (a red one) and Rigel (blue one). The center of this constellation is the Orion Belt with the Horsehead nebula (IC 434 - B33). Lower, the great Orion nebula, M42, a large star forming region. Also visible on this image, the Barnard's loop, a very faint nebula. This is composite mosaic image assembled from many hours of data including hydrogen alpha filtered exposure