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Voyager 2 was Earth's first visitor to Neptune and its Great Dark Spot.
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.