Buzz Aldrin walks on the surface of the moon during the Apollo 11 mission on July 20, 1969. AP
Buzz Aldrin walks on the surface of the moon during the Apollo 11 mission on July 20, 1969. AP
US astronauts Neil Armstrong and "Buzz" Aldrin deploy the US flag on the lunar surface. AP
US astronauts Neil Armstrong and "Buzz" Aldrin deploy the US flag on the lunar surface. AP
A US flag planted at Tranquility Base on the surface of the moon, and a silhouette of a thruster at right, seen from a window in the Lunar Module. AP
A US flag planted at Tranquility Base on the surface of the moon, and a silhouette of a thruster at right, seen from a window in the Lunar Module. AP
'Buzz' Aldrin is shown beside the foot of the Lunar Module during the Apollo 11 mission. Getty Images
'Buzz' Aldrin is shown beside the foot of the Lunar Module during the Apollo 11 mission. Getty Images
'Buzz' Aldrin on the surface of the Moon on July 20, 1969. EPA
'Buzz' Aldrin on the surface of the Moon on July 20, 1969. EPA

55th anniversary of Apollo 11 Moon landing - in pictures