The Apollo 11 crew (L to R) Neil Armstrong, commander, Michael Collins, command module pilot, and Buzz Aldrin, lunar module pilot, conduct a crew compartment fit and functional check of the equipment and storage locations in their command module at Kennedy Space Center, Florida on June 10, 1969. NASA marks the 40th anniversary of the Apollo 11 mission to the Moon and the historic first "moonwalk" this year. During the eight-day space mission, Armstrong and Aldrin explored the Moon's surface and brought back rock samples for scientists to study. Collins piloted the command module in the lunar orbit during their 22-hour stay on the moon. (UPI Photo/NASA)