Barnard's Loop around the Horsehead Nebula

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zorg.ch #85773 by [z]Barbara Harris @ 18.04.2006 00:00 - nach oben - Barnard's Loop around the Horsehead Nebula Explanation: Why is the Horsehead Nebula surrounded by a bubble? Although glowing like an emission nebula, the origin of the bubble, known as Barnard's Loop, is currently unknown. Progenitor hypotheses include the winds from bright Orion stars and the supernovas of stars long gone. Barnard's Loop is too faint to be identified with the unaided eye. The nebula was discovered only in 1895 by E. E. Barnard on long duration film exposures. The above image was taken in a single specific color emitted by hydrogen to bring out detail. To the left of the Horsehead Nebula, visible as the small dark indentation near the image top, is the photogenic Flame Nebula. Credit & Copyright zorg.ch #85774 by [z]Duke @ 18.04.2006 00:09 - nach oben - gottseidank posted d' barbara hie und da mol no, süsch wür jo gar nüt laufe. zorg.ch #85775 by Squeezer @ 18.04.2006 05:40 - nach oben - säg nünt...