Taken by Neil Armstrong on 20 July 1969, this photograph shows Buzz Aldrin standing on the lunar surface near the Eagle landing module in the Sea of Tranquility. Armstrong is reflected in Aldrin's helmet visor, holding the camera. The frame is one of approximately 1,400 photographs taken on the lunar surface during Apollo 11 and is among the most reproduced photographs of the entire twentieth century.

Aldrin and Armstrong spent 2 hours and 31 minutes outside the lander before returning. The photographs were taken with a modified Hasselblad 500EL fitted with a Zeiss Biogon lens — equipment selected for its mechanical reliability in the vacuum and temperature extremes of the lunar surface, where shutter mechanisms had to function across a 250°C temperature swing.

The image is in the public domain under NASA's release terms. The Apollo 11 mission was the first crewed landing on a celestial body other than Earth; the photographic record from the surface — this image, the first-footprint photograph, the planted-flag photograph, the Earth-rising-over-the-Moon image — is the single most documented event in the history of human exploration.