The Apollo program was designed to land humans on the Moon and bring
them safely back to Earth. Six of the missions (Apollos
11, 12, 14, 15, 16, and 17) achieved this goal. Apollos 7 and 9 were
Earth orbiting missions to test the Command and Lunar Modules, and did
not return lunar data. Apollos 8 and 10 tested various components while
orbiting the Moon, and returned photography of the lunar surface. Apollo
13 did not land on the Moon due to a malfunction,
but also returned photographs. The six missions that landed on the Moon
returned a wealth of scientific data and almost 400 kilograms of lunar
samples. Experiments included soil mechanics, meteoroids, seismic, heat
flow, lunar ranging, magnetic fields, and solar wind experiments.
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