NASA has begun a series of events to mark the 40th anniversary of the launch of the 1969 mission that put the first men on the moon.
In Washington on Thursday, the space agency screened newly-restored video showing astronauts Neil Armstrong and Buzz Aldrin when they took their first steps on the moon's surface.
Apollo 11 lifted-off on 16 July, 1969. Armstrong stepped on to the lunar surface four days later on 20 July. He was followed by Aldrin.
Former astronauts from the Apollo programme are also at Cape Canaveral, in Florida, to mark the launch.