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Astronauts Neil Armstrong and "Buzz" Aldrin landed the Apollo 11 Lunar Module (LM) in Mare Tranquillitatis [0.67416° N, 23.47314° E], at 20:17:40 UTC 20 July 1969. They spent a total of 21.5 hours on the lunar surface, performing one Extra-Vehicular Activity (EVA) and collecting 21.5 kg of lunar samples. Astronaut Michael Collins orbited the Moon in the Lunar Command Module (LCM), awaiting the return of Armstrong and Aldrin from the surface. Apollo 11 was the first lunar landing, however it was the fifth manned Apollo mission, earlier missions laying the ground-work for Apollo 11.

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