During eight days in July 1969, American astronauts Neil Armstrong, Buzz Aldrin and Michael Collins piloted the Apollo 11 space flight to the moon and back. Armstrong became the first being (human, anyway) to step onto the lunar surface on July 20. He and Aldrin spent 21 hours collecting rock and soil samples at "Tranquility Base" while Collins flew the Columbia command module in orbit around this crater-faced Round.

07.20.22