Illustration of the United States Naval Observatory (USNO) 26-inch (66 centimetre) Great Equatorial refracting telescope on its original mount at the Naval Observatory in Foggy Bottom, Washington DC, USA. In 1877 this telescope was used to discover Mars' two moons Phobos and Deimos. From 'Popular Astronomy' by Camille Flammarion (1880).

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Photo credit: © COLLECTION ABECASIS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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