Astronaut Neil Armstrong

A NASA photo from 1969 of Neil Armstrong, the first man to set foot on the moon. He was mission commander of the Apollo 11 moon landing, and with Buzz Aldrin, spent more than two hours exploring the lunar landscape.

Neil Armstrong, the first man to walk on the moon, is shown in July 2004. A recipient of the Congressional Space Medal of Honor, Armstrong made two trips into space before leaving NASA to teach in 1971. In recent years, he has served on the boards and as spokesman for several companies.

Neil Armstrong, center, appears with his Apollo 11 crewmates Michael Collins, left, and Buzz Aldrin in June 1969. Armstrong has received many honors and awards and has had dozens of schools in the U.S. named after him. Around the globe, streets and buildings have been named for the first man to walk on the moon.

Apollo 11 astronauts Neil Armstrong, left, Michael Collins, center, and Buzz Aldrin are shown in May 1969. An Eagle Scout, Armstrong was born in Wapakoneta, Ohio, on Aug. 5, 1930, and studied engineering at Purdue University. He served in the Navy and saw action during the Korean War.

President Richard M. Nixon greets the Apollo 11 crew, Neil Armstrong, right, Michael Collins, center, and Buzz Aldrin, after their return from their historic flight to the moon. Armstrong has been married twice. He divorced his first wife after 38 years in 1994 and married his second wife that same year.

Buzz Aldrin and Neil Armstrong plant a U.S. flag on the moon surface during the Apollo 11 mission on July 20, 1969.

Astronauts Neil Armstrong, front, and David Scott prepare for the Gemini 8 space mission on March 15, 1966. It was Armstrong's first space flight.

President George W. Bush meets with the Apollo 11 crew, Neil Armstrong, left, Michael Collins, center and Buzz Aldrin on July 21, 2004, the 35th anniversary of their landing on the moon.

Neil Armstrong, the first man to walk on the moon, is shown in July 2004.