Voyager 2 completed its “grand tour” of the outer solar system in 1989 by returning the first in situ observations of Neptune, its rings, and its satellites. The probe revealed that the Neptunian system is dynamic and diverse. Major discoveries include atmospheric bands and large storms on Neptune, the existence and orientation of Neptune's magnetic field, a system of four dark rings, six small satellites, and the geologically spectacular and active surface of Neptune's largest moon, Triton. The observations offer important clues to the origin and evolution of the Neptunian system and the outer solar system and raise many new questions.
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