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After two years in space, the Voyager missions reached Jupiter in 1979, sent by NASA and the Jet Propulsion Laboratory. The Voyager 1 approach phase began January 4, 1979, with encounter of the Jovian system 60 days later. It passed close to all four Galilean moons. Voyager 2 encountered the system on July 9, 1979, taking close-up photos of Callisto, Ganymede, Europa, and Amalthea. The excellent photos from the Voyager missions revealed Jupiter's rings, active volcanoes on Io, and the diversity of surfaces on the Jovian moons. Voyager data also brought the number of known moons of Jupiter to 16.

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