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The moons of Uranus, to scale The major moons of Uranus to scale. These images were taken on January 24, 1986. The geologic diversity these moons show begs for another mission to explore them thoroughly. Sadly, we have never been back, but the newest Planetary Science Decadal survey recommends a Uranus orbiter and probe mission as one of NASA's next priorities. Top row: Titania, Oberon. Bottom Row: Umbriel, Ariel. Top Middle: Miranda. Bottom Middle: Puck. NASA / JPL / Ted Stryk