2/9US astronaut Neil Armstrong (C) gives a thumbs-up after receiving the Congressional Gold Medal at the US Capitol in Washington, November 16, 2011.
3/9Neil Armstrong, commander of Apollo 11 and the first man on the moon, laughs during testimony before a House Science, Space and Technology committee hearing in Washington, September 22, 2011.
4/9Apollo 11 astronaut, and the first man to walk the moon, Neil Armstrong, left, holds the Langley Gold Medal after it was presented to him by Vice President Al Gore at a ceremony at the Smithsonian Air And Space Museum in Washington, July 20, 1999.
5/9Apollo 11 crew of US astronauts Neil Armstrong, (L) who was the Mission Commander and the first man to step on the moon, Edwin "Buzz" Aldrin, (R), who was the Lunar Module Pilot, and Michael Collins, (C). May 1969 (courtesy NASA)
6/9Undated file photo provided by NASA shows Neil Armstrong
7/9Apollo XI Astronauts Neil Armstrong (L), Michael Collins (C), and Buzz Aldrin laugh with President Richard Nixon aboard the USS Hornet, courtesy Richard Nixon Foundation, July 24, 1969.
8/9Neil Armstrong, US civilian astronaut, became first man to walk on the moon as flight commander of Apollo 11 space mission, July 1969.
9/9undated image provided by NASA shows Neil Armstrong posing with a X-15.
