SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
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Computer-coloured optical photograph of the Horsehead Nebula (NGC 2024), a dark nebula in the constellation of Orion. The nebula is created by opaque dust which absorbs light from the stars beyond. The Horsehead lies at a distance of over 1000 light years. The original black-and-white photograph was taken with the 4-metre telescope at the Kitt Peak National Observatory in Arizona.
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