Astronauts have landed on the moon six times. In addition to the moon landings, NASA has sent astronauts on missions to flyby or orbit the moon three times.
The primary moon missions were the Apollo Lunar Missions. Astronauts landed on the moon during Apollo 11, Apollo 12, Apollo 14, Apollo 15, Apollo 16 and Apollo 17. On Apollo 8 and Apollo 10, astronauts circled the moon and returned to Earth. On Apollo 13, which ran into trouble, the astronauts only flew by the moon. During the mission, an oxygen tank leaked and exploded, causing major systems to fail all over the ship, including the electrical system and propulsion. The crew also lost much of their oxygen. Nonetheless, the crew members of Apollo 13 managed to return to Earth safely.