Since Voyager 2’s 1986 flyby, scientists have speculated about Miranda’s potential as an “ocean world.” It could harbor a hidden ocean beneath its icy crust.

Miranda reveals a complex geologic history in this view, acquired by Voyager 2 on Jan. 24, 1986, around its close approach to the Uranian moon. (Image credit: JPL) ...

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Given Miranda's modest radius of only 146 miles (235 kilometers), the ocean would have represented nearly half the moon's entire volume. Strom noted, “That result was a big surprise to the team.” ...

Miranda is the smallest and innermost of Uranus's five round satellites and orbits the planet around once every 1.4 Earth days, according to Nasa.