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Umbriel

Umbriel (Uranus II) One of the major satellites of Uranus. Its mean radius is 584.7km; mass 11.72 × 1020 kg; mean density 1400 kg/m3; albedo 0.18. The surface is evenly cratered and darker than the other four major satellites, except for a bright ring 4 km in diameter. The many large craters suggest the surface is old.

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"Umbriel." A Dictionary of Earth Sciences. . Encyclopedia.com. 26 Jul. 2017 <http://www.encyclopedia.com>.

"Umbriel." A Dictionary of Earth Sciences. . Encyclopedia.com. (July 26, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/umbriel

"Umbriel." A Dictionary of Earth Sciences. . Retrieved July 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/umbriel

Umbriel

Umbriel (ŭm´brēĕl´), in astronomy, one of the moons, or natural satellites, of Uranus.

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"Umbriel." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 26 Jul. 2017 <http://www.encyclopedia.com>.

"Umbriel." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (July 26, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/umbriel

"Umbriel." The Columbia Encyclopedia, 6th ed.. . Retrieved July 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/umbriel

Umbriel

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"Umbriel." Oxford Dictionary of Rhymes. . Encyclopedia.com. 26 Jul. 2017 <http://www.encyclopedia.com>.

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"Umbriel." Oxford Dictionary of Rhymes. . Retrieved July 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/umbriel