Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary


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Umbriel

A moon of 1169 km diameter at about 266,000 km from the planet Uranus. The gravity at its surface is about 0.0233 times as strong as on Earth. The moon goes once around its planet in about 99.5 hours. The moon was discovered in 1851. Also called UII (Uranus two).