For 10 points—name this planet that lies four and a half billion kilometers away from the sun, with moons including Naiad and Proteus.
Its outermost Adams ring is comprised of the Liberty, Equality, and Fraternity arcs. Transient "great dark spots" are observed, including one spot known as "The Scooter." It has been visited only by Voyager 2, which confirmed surface gravity roughly comparable to Earth's. For 10 points—name this planet that lies four and a half billion kilometers away from the sun, with moons including Naiad and Proteus.
Its outermost Adams ring is comprised of the Liberty, Equality, and Fraternity arcs.
{Neptune}