Main Page | See live article | Alphabetical index The Coalsack Nebula is the most prominent dark nebula in the skies, well visible to the naked eye as a dark patch silhouetted against the southern Milky Way. The Coalsack is located approximately 600 light years away, in the constellation Crux, covering nearly 7° by 5° and overlaps somewhat into the neighbour constellations Centaurus and Musca. The Coalsack nebula Although this nebula was known to the people of the Southern Hemisphere in prehistoric times, its first observation was reported by Vincente Yanez Pinzon in 1499. It was named “il Canopo fosco” by Amerigo Vespucci and was also called “Macula Magellani” (Magellan's Spot) or “Black Magellanic Cloud” in opposition to the Magellanic Clouds. In 1970, K. Mattila proved the Coalsack is not totally black; it has a very dim glow (10% of the brightness of the surrounding Milky Way) which comes from the reflection of the stars it obscures. The Coalsack is not present in the NGC and does not have an identification number. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.