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The Horsehead Nebula, catalogued as Barnard 33, is located 1,500 lightyears away in the constellation Orion. It is about 5 lightyears 'tall', and is only visible because it is silhouetted against the red emission nebula IC 434. In the lower left corner of the photo is the blue reflection nebula NGC 2023.

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Horsehead Nebula B33

Photo by Daniel Verschatse, Antilhue Observatory, Chile