HARVARD COLLEGE OBSERVATORY / SCIENCE PHOTO LIBRARY HARVARD COLLEGE OBSERVATORY / SCIENCE PHOTO LIBRARY
First image of the Horsehead Nebula. Photographic plate B2312 capturing the Horsehead Nebula (above uppermost star of Orion's belt at right) for the first time. The nebula is approximately 1500 light years from Earth in the constellation Orion. The nebula was discovered by Williamina Fleming, one of the Harvard Observatory's female computers. The Orion nebula is at centre. The image was taken on 7th February 1888, from Harvard College Observatory, Cambridge, Massachusetts, USA, with the 8-inch Bache Doublet, Voigtlander, reworked by Clark. The exposure was 90 minutes.
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