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Lunar Orbiter was the project that mapped the Moon in preparation for the Apollo landings. A total of five Lunar Orbiters were flown to the Moon. They were built for NASA's Langley Research Center by Boeing and launched to the Moon on Atlas-Agena rockets. The first three orbited around the Moon's equator and provided detailed photographic coverage of the primary Apollo landing sites, including stereo images. Because of the success of these earlier missions, the final two Lunar Orbiters were placed into a polar orbit so that virtually the entire surface of the Moon was mapped. In addition to images of the Apollo landing sites, Lunar Orbiter provided many breathtaking photographs, including features on the far side Lunar Orbiter, Engineering Mock-up, 1960s. Creator: Boeing Aircraft Co.. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)