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Ariel ''(air'-ee-əl,'' IPA ) is a Moon of Uranus discovered on 24 October 1851 by William Lassell . It was discovered at the same time as Umbriel . NAME Ariel is named after the leading Sylph in Alexander Pope's poem '' Rape Of The Lock ''. It is also the name of the spirit who serves Prospero in Shakespeare's '' Tempest ''. The name "Ariel" and the names of all four satellites of Uranus then known were suggested by naming scheme for the seven then-known satellites of Saturn and had named his newly-discovered eighth satellite Hyperion in accordance with Herschel's naming scheme in 1848 . The adjectival form of the name is ''Arielian''. It is also designated Uranus I. PHYSICAL CHARACTERISTICS See Also: List of geological features on Ariel The first and so far only close-up observations of Ariel were made by the '', only the southern hemisphere was photographed. Ariel's composition is roughly 70% ices (water ice, carbon dioxide ice, and possibly , at only 78 km across, and shows signs of deformation since its formation. ''Voyager 2'' also observed a network of Faults , Canyon s, and icy outflows running along Ariel's mid-southern latitudes, breaking up the cratered plains region. The canyons probably represent Graben s formed by Extensional Fault ing. Smooth material and grooves are often seen running down length of Ariel's valley networks, suggested that some canyon floors have been covered in warm ice extruded from Ariel's interior. Official names have been given to the following Geological Feature types on Ariel: TRIVIA
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