What Planets Have Astronauts Explored?

As of December 2014, no planets besides Earth have been visited by astronauts. The only extraterrestrial object that has hosted any humans in person is the moon, with a total of six manned landings conducted by NASA from July 20, 1969, to Dec. 7, 1972.

NASA has established the goals of landing a manned spacecraft on an asteroid by 2025 and one on Mars during the 2030s. Though no manned expeditions of other planets have occurred since 1972, NASA has been exploring the surface of Mars through the use of unmanned robotic technology since Jan. 3, 2004, when the first Martian exploration rover successfully landed.