Uranus is the second outer-most planet in the solar system. Characteristics:
Among the solar system planets, it is easily most similar to Neptune, with a slightly larger radius and a slightly smaller mass. Its moons include Miranda, Ariel, Umbriel, Oberon, Titania. It has a ring system, and within the solar system, only Saturn's are more extensive and were discovered earlier.
The only mission to fly near Uranus was Voyager 2 in 1986.