Rings of Uranus reveal secrets of the planet’s moon Cressida
![photo of Uranus taken by Voyager in 1986](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/09/090117_ay_uranusmoons_feat_free.jpg?fit=860%2C460&ssl=1)
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