Aug. 26, 2012: Kirsten South looks at the Neil Armstrong statue that is covered with flower, signs and candles outside of the Neil Armstrong Hall of Engineering, on the campus of Purdue University in West Lafayette, Ind. Armstrong, the first man to walk on the moon, is a graduate of the university. (AP Photo/Journal & Courier, Michael Heinz)
July 20, 1969: Apollo 11 astronauts Neil Armstrong and Edwin E. "Buzz" Aldrin, the first men to land on the moon, plant the U.S. flag on the lunar surface. (AP Photo/NASA)
Aug. 26, 2012: Senate Minority Leader Sen. Mitch McConnell, R-Ky., checks out the stage of the Republican National Convention in front of a picture of Neil Armstrong. (AP Photo/David Goldman)
Aug. 26, 2012: A worker is silhouetted in front of a picture of Neil Armstrong, the first man to walk on the moon, on the main stage of the Republican National Convention in the Tampa Bay Times Forum in Tampa, Fla. (AP Photo/Charlie Neibergall)
Aug. 25, 2012: Robert Spellman, telescope demonstrator at the Griffith Observatory, joins visitors in a minute of silence for astronaut Neil Armstrong in Los Angeles. (AP )
Aug. 25, 2012: Visitors gather around the Apollo 11 command module "Columbia" that carried astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins on their historic voyage to the Moon and back on July 16 to 24, 1969, at the Smithsonian Institution's National Air and Space Museum in Washington.
(AP )
June 1, 2012: Neil Armstrong, the first man to walk on the moon, attends a graveside service for Wilbur Wright on the 100th anniversary of the burial of the powered flight pioneer in Dayton, Ohio. (AP )
July 24, 1969: This photo provided by the Richard Nixon Foundation shows Apollo XI astronauts, from left, Neil Armstrong, Michael Collins and Buzz Aldrin laughing with President Richard Nixon aboard the USS Hornet. (AP )
Feb. 20, 2012: Apollo 11 Astronaut Neil Armstrong speaks at a celebration dinner honoring John Glenn in Columbus, Ohio. (AP Photo/NASA, Bill Ingalls)
Sept. 17, 1962: Neil Armstrong is introduced to the press, along with the other astronauts in Houston at a NASA press conference surrounding his planned mission to the moon. Armstrong and fellow astronaut Edwin "Buzz" Aldrin spent nearly three hours walking on the moon, collecting samples, conducting experiments and taking photographs. (AP Photo)