"That's one small step for a man...." said Neil Armstrong -- but depending on whom you ask, they may not have been the first words spoken from the moon.
They weren't? Armstrong's crewmate, Buzz Aldrin, sometimes claims that he got in the first line. Six hours earlier, as the Apollo 11 Lunar Module Eagle touched down, it was Aldrin who called out, "Contact light."
Forty years after that historic day, myths and forgotten stories continue to hover over what Armstrong called Tranquility Base. Here, in a similar spirit, are a half dozen things you may never have heard about Apollo 11.
The computer on board Eagle was not much more powerful than a digital watch today, and as the ship descended, its rocket engine at full blast, Armstrong realized the system was steering the astronauts toward a rugged crater the size of a football field.
He took over control, and went shooting over the landscape in search of smoother ground. As he went, Eagle gulped fuel. They ran so low that Aldrin called out, "Contact light," just 17 seconds before mission control would have told the astronauts to jettison the ship's landing stage, fire the ascent engine and abort the landing.
Would Armstrong, knowing by then he was so close, actually have made that risky move? We will never know.
Armstrong's name will live in history. Many people thought at the time he was hand-picked by NASA for the moon landing; he happened to be the only Apollo commander who wasn't a military officer at the time.
But the astronauts' boss, Deke Slayton, had a system of rotating crews among missions. He picked six three-man teams. Each would be the backup crew for one flight, and then actually fly three flights later. Neil Armstrong happened to be the backup commander of Apollo 8, which made him the commander of Apollo 11 – which would not have been the lunar landing flight if Apollo 9 and Apollo 10 had gone badly.
Do you remember Borman's name? He, James Lovell and William Anders flew Apollo 8 around the moon on Christmas Eve, 1968 -- and Slayton thought that experience might make the difference between success and failure for the actual landing. So, breaking with his system, he offered Borman the chance to jump ahead in line and make the lunar landing flight.
Andrew Chaikin, co-author with Victoria Kohl of "Voices from the Moon," interviewed both men, and says Borman turned the offer down.
"He was a team player, a military man, happy to have made a big play, but he didn't feel the need to score the touchdown," said Chaikin. "And his wife was anxious for him to stop flying and risking his life."
So Slayton went back to his regular crew-rotation system, and it is Armstrong's name we are hearing today.
Think of all the vivid color photographs you've seen of the Apollo 11 astronauts on the lunar surface. Almost all the pictures are of Buzz Aldrin, not of Armstrong.