In this March 9, 1966 file photo, astronaut Neil Armstrong is seated during a suiting up exercise at Cape Kennedy in preparation for the Gemini 8 flight. AP Photo.
The three crew members of NASA's Apollo 11 lunar landing mission pose for a group portrait a few weeks before the launch, May 1969. From left to right, Commander Neil Armstrong, Command Module Pilot Michael Collins and Lunar Module Pilot Edwin 'Buzz' Aldrin Jr. (Photo by Space Frontiers/Getty Images)
Neil Armstrong leads Edwin 'Buzz' Aldrin and Michael Collins out of the space centre on the Apollo 11 space mission to the moon. (Photo by Keystone/Getty Images)
The Apollo 11 space module floating above the Moon. The Earth can be seen rising behind. (Photo by Keystone/Getty Images)
US astronaut Buzz Aldrin climbs down the ladder from the lunar module "Eagle" 15 minutes after Neil Armstrong on July 21, 1969. The two astronauts of the Apollo 11 mission are the first men in history to walk of the moon's surface. AFP PHOTO NASA (Photo by - / NASA / AFP)
Apollo 11 astronauts Neil Armstrong and Edwin E. Aldrin, plant the U.S. flag on the lunar surface, July 20, 1969. July 20, 1999 marks the 30th anniversary of the landing on the moon by the Apollo II crew. Photo was made by a 16mm movie camera inside the lunar module, shooting at one frame per second. (AP Photo/NASA)
Astronaut Edwin "Buzz" Aldrin poses next to the U.S. flag July 20, 1969 on the moon during the Apollo 11 mission. (Photo by NASA/Liaison)
Buzz Aldrin Jr. photographed walking near the lunar module (Photo By Nasa/Getty Images)
A family watches the American astronaut Neil Armstrong commander of Apollo 11, setting his foot on the moon in Paris. Hundreds of millions of television viewers around the world watched this event on television. Picture: AFP/Getty Images
In this Aug 13, 1969 file photo, New Yorkers line 42nd Street to cheer Apollo 11 astronauts, in lead car from left are, Edwin Aldrin, Michael Collins and Neil Armstrong. Picture: AP Photo.
Buzz Aldrin visited Carleton Community High School, Pontefract in 2008 to discuss his memories of the moon landing.
In this July 20, 2009, photo, Buzz Aldrin, left, Michael Collins, centre, and Neil Armstrong stand in the Oval Office at the White House in Washington, on the 40th anniversary of the Apollo 11 moon landing. Armstrong died in 2012 (AP Photo/Alex Brandon)