Apollo 11 was the first spaceflight to land humans on the Moon, conducted by NASA from July 16th to 24th 1969. Commander Neil Armstrong and Lunar Module Pilot Edwin "Buzz" Aldrin landed the Lunar Module Eagle on July 20th at 20:17 UTC. Armstrong became the first person to step onto the surface about six hours later, at 02:56 UTC on July 21st. Aldrin joined him 19 minutes afterward, and together they spent about two and a half hours exploring the site they had named Tranquility Base upon landing. They collected 47 pounds of lunar material to bring back to Earth before re-entering the Lunar Module. In total, they were on the Moon’s surface for 21 hours and 36 minutes before returning to the Command Module Columbia, which remained in lunar orbit, piloted by Michael Collins.