Rings of Uranus reveal secrets of the planet’s moon Cressida

photo of Uranus taken by Voyager in 1986

In 1986, Voyager 2 discovered a clutch of moons orbiting Uranus. Figuring out how massive the moons are and what they’re made of gives clues to their ultimate fate.

Erich Karkoschka/Univ. of Arizona, Voyager 2, NASA

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