5 of 20: FILE - In this Feb. 11, 1986 file photo, former astronaut Neil Armstrong, a member of the presidential panel investigating the Space Shuttle Challenger explosion, listens to testimony before the commission in Washington, David Acheson, a commission member, listens in the background. A model of the shuttle sits on the table. The family of Neil Armstrong, the first man to walk on the moon, says he has died at age 82. A statement from the family says he died following complications resulting from cardiovascular procedures. It doesn't say where he died. Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. He radioed back to Earth the historic news of "one giant leap for mankind." Armstrong and fellow astronaut Edwin "Buzz" Aldrin spent nearly three hours walking on the moon, collecting samples, conducting experiments and taking photographs. In all, 12 Americans walked on the moon from 1969 to 1972. (AP Photo/ Scott Stewart)

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