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Umbriel is a moon of Uranus and the third most massive of the Uranian moons. Discovered on October 24, 1851, by William Lassell, it is one of the darker moons of Uranus, with a low reflectivity indicating a surface covered in carbonaceous material.

Key Facts

Surface and Composition

Umbriel's surface is marked by numerous impact craters and has a much darker and older surface compared to other moons. It appears to be composed primarily of water ice with a significant amount of darker, rocky material.

Interesting Facts

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