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The Coalsack Nebula is one of the best known dark nebulae in the sky, along with the nearby Dark Doodad Nebula and the Horsehead Nebula. The Coalsack is located in the southern constellation Crux and overlaps into the neighbouring constellations Musca and Centaurus.

The dark cloud of cold gas and dust lies at a distance of 600 light years from Earth and is about 30 to 35 light years across.
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