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The largest storm on Uranus was named the "Great Dark Spot." It is a storm that's similar to Jupiter's Great Red Spot, including its geographic location on the planet. It has winds up to 1,000 miles an hour.
Astronomers could not locate this storm with the Hubble telescope after it was re-calibrated in 1994.
Voyager returned these images of Neptune's rings.
Triton is the largest moon orbiting Neptune. According to readings from Voyager, the moon most likely did not originate from Neptune but was a lost mass that was captured by the huge planet's gravitational force. It's moving in a retrograde orbit, which means it spins in the opposite direction of the planet's rotation.
Triton is about three-fourths the size of the Earth's moon. It also has about the same size, density, temperature and chemical composition as Pluto.