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This Voyager 1 photo from 1980 showed the fuzzy layer of atmosphere on Saturn's moon, Titan. The Titan findings of the Voyagers helped draw enough interest to send the Cassini spacecraft to Saturn and land a probe on Titan. Cassini is still orbiting Saturn and returning images.
The Voyagers discovered new information about the rings that revolve around Saturn, in particular the twisted F-Ring. One discovery was how the nearby moons affect the structure of the rings.
In January 1986, the first human-made visitor to Uranus was Voyager 2. Left is a true-color view of the planet and a false color view is right.