The Apollo 13 lunar landing was aborted after an oxygen tank in the service module failed two days into the mission. The story of Apollo 13 is an enduring tale of survival, perseverance and innovation in the face of emergency.

The primary mission objectives of the second crewed lunar landing included an extensive series of lunar exploration tasks by the lunar module, or LM, crew, as well as the deployment of the Apollo Lunar Surface Experiments Package, or ALSEP, which was to be left on the moon's surface to gather

The primary objective of Apollo 11 was to complete a national goal set by President John F. Kennedy on May 25, 1961: perform a crewed lunar landing and return to Earth.

The Apollo 10 mission encompassed all aspects of an actual crewed lunar landing, except the landing. It was the first to operate around the Moon. Objectives included a scheduled eight-hour lunar orbit of the separated lunar module, or LM, and descent to about nine miles off the Moon's surface before

The mission of Surveyor 7 was to explore a region of the Moon other than lunar maria and into the lunar highlands. Surveyor 7 was the first probe to detecet the faint glow on the lunar horizon after dark that is now thought to be light reflected from electrostatically levitated

The mission of Surveyor 6 was to demonstrate the technology necessary to achieve landing and operations on the lunar surface. Before termination of operations, on Nov. 17, 1967, Surveyor 6 was commanded to fire its three main liquid propellant thrusters for 2.5 seconds.

The mission of Surveyor 5 was to demonstrate the technology necessary to achieve landing and operations on the lunar surface. Surveyor 5 was the first human spacecraft to complete a soil analysis on another celestial boday other than Earth.

Lunar Orbiter 5 completed the farside coverage and acquired medium (20 m) and high (2 m) resolution images of 36 pre-selected areas. Luna Orbiter 5's primary mission was to contribute to a comprehensive map of the Moon and conduct general observational surveys.

Explorer 35, also known as the Anchored Interplanetary Monitoring Platform (AIMP-E or AIMP-6) was designed to study interplanetary space phenomena, particularly the solar wind, the interplanetary magnetic field, dust distribution near the Moon, the lunar gravitational field, the weak lunar ionosphere, and the radiation environment.

The mission of Surveyor 4 was to demonstrate the technology necessary to achieve landing and operations on the lunar surface. Radio signals from the spacecraft stopped a few minutes before landing and contact was never reestablished.