Tuesday, July 20, 1999 Published at 10:12 GMT 11:12 UK
Frustration on Moonwalk anniversary
The Moon remains the only other world mankind has visited
On Tuesday, 30 years ago, mankind became genuine space travellers when two men walked on the Moon.
The Apollo 11 mission was achieved by the collaboration of 400,000 people in the US space programme and cost $25bn.
But the anniversary has brought not just new details of the Moon landings but sadness that this first step into space was not followed by others.
Mr Aldrin said history would record the 20th century as the time when humans went from the Wright brothers' first powered flight to the moon in 66 years, only to languish in "low Earth orbit" for the next three decades.
The Apollo astronauts, now in their 60s and 70s, have publicly lamented the failure to establish a colony on the Moon and send an astronaut to Mars. They have issued fresh calls for such missions.
"Man can successfully travel to another planet ... but he cannot live in the past," said George Mueller, who as Nasa's associate administrator of manned space flight for much of the 1960s directed the Apollo programme
He looks back with mixed emotions. "I remember it being a great achievement. I also remember a disappointment that the political situation was such that we didn't continue the exploration of the moon and beyond."
The new revelations about Apollo 11 have included the fact that if Armstrong and Aldrin had been stranded on the Moon, their communications systems would have been turned off, leaving them to die in silence.
Also revealed is the truth about what Armstrong said when he put his foot on the Moon, one of the most famous quotes of all time.
Listening to the recording it sounds like: "That's one small step for man - one giant leap for mankind." But for years later the official transcript of the mission added an "a" before "man".
In an extremely rare public appearance last Friday, he set the record straight.
Before the mission his wife helped him with the choice of words. As he stepped off the lander's footpad he wanted to say "a small step for a man, a giant leap for mankind", and that is what he thought he did say. But after listening carefully to recordings of his words he now admits that he forgot the "a".