(L to R) Apollo 11 crew members, Buzz Aldrin, Michael Collins, Neil Armstrong pose for photos with US President Barack Obama in Washington DC, USA, 20 July 2009. The meeting marked the 40th anniversary of the landing of Apollo 11 on the moon. EPA/MATTHEW CAVANAUGH
Retired astronauts Buzz Aldrin (C) of Apollo 11, Charles Duke (R) of Apollo 16 and David Scott (L) of Apollo 9 and Apollo 15 attend a news conference with other retired astronauts to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. EPA/MICHAEL REYNOLDS
Retired astronauts Buzz Aldrin (R) of Apollo 11 and David Scott (L) of Apollo 9 and Apollo 15 attend a news conference with other retired astronauts to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. EPA/MICHAEL REYNOLDS
Retired astronauts Buzz Aldrin of Apollo 11 attends a news conference with other retired astronauts to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. EPA/MICHAEL REYNOLDS
Retired astronauts Buzz Aldrin (R) of Apollo 11 and David Scott (L) of Apollo 9 and Apollo 15 attend a news conference with other retired astronauts to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. EPA/MICHAEL REYNOLDS
US President Barack Obama meets with Apollo 11 crew members (l-r) Edwin Eugene 'Buzz' Aldrin, Jr., Michael Collins, and Neil Armstrong in the Oval Office of the White House in Washington DC, USA, on 20 July 2009 on the 40th anniversary of the astronauts' lunar landing. EPA/Martin H. Simon / POOL 2009, Martin H. Simon
Retired astronauts Buzz Aldrin (L) of Apollo 11 and Charles Duke (R) of Apollo 16 attend a news conference with other retired astronauts to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. EPA/MICHAEL REYNOLDS
Retired astronauts Buzz Aldrin (L) of Apollo 11 and Charles Duke (R) of Apollo 16 attend a news conference with other retired astronauts to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. EPA/MICHAEL REYNOLDS
Retired astronaut Buzz Aldrin (3-L) of Apollo 11 attends a news conference with other retired astronauts to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. Also in the picture (L to R); James Lovell of Apollo 8 and Apollo 13, David Scott of Apollo 9 and Apollo 15, Charles Duke of Apollo 16, Thomas Stafford of Apollo 10 and Eugene Cernan of Apollo 10 and Apollo 17. EPA/MICHAEL REYNOLDS
Retired astronaut Buzz Aldrin of Apollo 11 attends a news conference to commemorate the achievements of the Apollo program and the 40th anniversary of the first lunar landing, at the National Aeronautics and Space Administration (NASA) headquarters in Washington DC, USA, 20 July 2009. The 40th anniversary of the landing of Apollo 11 on the moon occurs 20 July 2009. EPA/MICHAEL REYNOLDS
