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Space Barnard's Loop around the Horsehead Nebula

Discussion in 'Tech, Science, and Space' started by Robby, Feb 24, 2009.

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  1. Robby

    Robby The Robot

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    NASA Astronomy Picture Of The Day
    Barnard's Loop around the Horsehead Nebula


    [​IMG]


    Barnard's Loop around the Horsehead Nebula
    Credit & Copyright: Drew Sullivan (Ancient Starlight)

    Explanation: Why is the Horsehead Nebula surrounded by a bubble? Although hard to make out above, the famous Horsehead Nebula is the slight dark indentation in the bright streak just to the left of the image center. 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 a small dark indentation, is the photogenic Flame Nebula, while the textured area just below it is the Foxfur Nebula.



    (Via NASA)
     

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