Five Lunar Orbiter missions were launched in 1966 through 1967 with the purpose of mapping the lunar surface before the Apollo landings. Experiments and results from all five missions are included here.

THE LUNAR ORBITER PROGRAM The Lunar Orbiter Spacecraft The Lunar Orbiter program, initiated in early 1964, consisted of the investigation of the Moon by five identical unmanned spacecraft. The spacecraft weighed approximately 390 kilograms at launch, were 1.5 meters in diameter, and were 2 meters in length. Solar panels supplied the required power. The main purpose of the program was to locate ...