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8 of 8 Major Planets Visited by Human Spacecraft (plus Pluto & Ceres)
Planets Visited Over Time
First Successful Flyby / Orbit Milestones
1962
Venus (Mariner 2)
First successful interplanetary flyby of another planet.
1965
Mars (Mariner 4)
First close-up photographs of the Martian surface.
1973
Jupiter (Pioneer 10)
First spacecraft to cross the asteroid belt and visit Jupiter.
1974
Mercury (Mariner 10)
First gravity-assist flyby mapping Mercury.
1979
Saturn (Pioneer 11)
First close inspection of Saturn's ring systems.
1986
Uranus (Voyager 2)
First and only spacecraft to explore the ice giant Uranus.
1989
Neptune (Voyager 2) - 8/8 Completed
Voyager 2 completed exploration of all 8 major planets in the solar system.
2015
Pluto & Ceres (New Horizons & Dawn)
Robotic probes reached dwarf planets Pluto in the Kuiper Belt and Ceres in the asteroid belt.