molecular ring, centered around Lambda Orioinis (Meissa). It was suggested that this ring formed after a supernova occurred inside the central star-forming region that once surrounded the Lambda Orionis Cluster, dispersing the material into the ring seen today. Star-formation is still continuing in regions of the ring. Superbubble Parts of the Orion-Eridanus superbubble were first seen as Barnard's Loop in Hydrogen-alpha images that warp around the eastern portion of Orion. The other part of the superbubble that is seen in H-alpha is the Eridanus Loop. The walls of the entire bubble are seen in far-infrared and HI. Some features of the Eridanus Loop might be as close as 590 light-years (180 parsecs) to the sun. Gallery See also Runaway star Rho Ophiuchi cloud complex Taurus molecular cloud Perseus molecular cloud Scorpius–Centaurus association References External links Orion Cloud Complex SEDS website ESO: Hidden Secrets of Orion’s Clouds incl. Photos & Animations Orion (constellation) Molecular clouds