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It has been visited by only one spacecraft, Voyager 2 on Jan 24 1986.
Uranus spins differently from most planets. It seems to be tilted "sideways" instead of right-side up. At the time of Voyager 2's passage, Uranus' south pole was pointed almost directly at the Sun .
Uranus has 15 known moons. Voyager 2 discovered 10 small moons in addition to the 5 large ones already known. It is likely that there are many more tiny moons within the rings.
Neptune's blue color is the result of a gas called "methane" in its atmosphere. Like the other gas planets , Neptune has rapid winds trapped in "bands" of latitude and large storms. Neptune's winds are the fastest in the solar system, reaching 2000 km /hour
Neptune has 8 known moons; 7 small ones and a large moon called " Triton ."