Proteus
Launched in August 1977, Voyager 2 made a flyby of the planet Neptune August 25, 1989. It is the only spacecraft to have visited Neptune and Uranus. During its pass, it took photographs of Triton, Neptune's largest moon and discovered Proteus, the second largest moon.
Voyager 2 is expected to enter interstellar space in 2019 or 2020. It is still sending weak signals and will continue to do so until about 2025.
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