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  • The Apollo Lunar Module, originally designated the Lunar Excursion Module, was the lander portion of the Apollo spacecraft built for the US Apollo program by Grumman to carry a crew of two from lunar orbit to the surface and back. Designed for lunar orbit rendezvous, it consisted of an ascent stage and descent stage, and was ferried to lunar orbit by its companion Command and Service Module, a separate spacecraft of approximately twice its mass, which also took the astronauts home to Earth. After completing its mission, the LM was discarded. It was capable of operation only in outer space, structurally and aerodynamically incapable of flight through the Earth's atmosphere. Six such craft successfully landed on the Moon between 1969 and 1972, and a seventh provided propulsion and life support for a successful return of a crew to Earth exceeding its design requirements, in 1970 when the CSM was disabled by an oxygen tank explosion en route to the Moon. The LM's development was plagued with problems which delayed its first unmanned flight by about ten months, and its first manned flight by about three months.

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