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The following was retrieved from Wikipedia, the free encyclopedia, at en.wikipedia.org/wiki/Horsehead_Nebula on November 21, 2016.

Horsehead Nebula

"The Horsehead Nebula (also known as Barnard 33) is a dark nebula in the constellation Orion. The nebula is located just to the south of the star Alnitak, which is farthest east on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex. The nebula was first recorded in 1888 by Scottish astronomer Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory. The Horsehead Nebula is approximately 1500 light years from Earth. It is one of the most identifiable nebulae because of the shape of its swirling cloud of dark dust and gases, which bears some resemblance to a horse's head when viewed from Earth."

The license terms of this written work from Wikipedia may be found at http://creativecommons.org/licenses/by-sa/3.0/.

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