Apollo 10 Commander Tom Stafford pats the nose of a stuffed Snoopy.
The year was 1969, and his vessel was the first to be equipped with a color camera, which was beaming live images to an awestruck global audience.
"I was feeling real high," recalled Stafford, who is now 88 and the last surviving member of the crew.
"I said: 'Think you could call over to London and tell the president of the Flat Earth Society that he's wrong?
It was a light moment during a mission of paramount importance: 50 years ago this week, Apollo 10 set off to finalize the preparations for Apollo 11's lunar landing.
The mission's objectives included an eight-hour orbit in a lunar module that Stafford flew down to within nine miles (14 kilometers) of the Moon's surface.
Apollo 10 paved the way for Neil Armstrong's "giant leap for mankind" two months later -- a historic milestone and a colossal geopolitical win for the United States at the height of the Cold War.
The US entered the space race well behind the Soviet Union, which put the first artificial satellite, Sputnik 1, into orbit in 1957, and sent up the first human, Yuri Gagarin, four years later.
To catch up, the Gemini program was conceived to devise rendezvous and docking techniques for an eventual mission to the Moon.
"As a boy I'd read about Buck Rogers, Flash Gordon -- you'd see these spaceships flying together. Nobody had ever done it," Stafford said at a Washington event commemorating the anniversary.
The Oklahoma native was chosen for the two-man Gemini 6A mission, which could have ended in tragedy had it not been for the quick thinking of Commander Wally Schirra.
Seconds before lift-off on December 12, 1965, they realized the engines of their Titan II rocket had cut out.
Tom Stafford is being shown a pennant bearing the Peanuts comic book character Snoopy.
Snoopy to the Moon
But perhaps Stafford's finest hour would be the Apollo 10 mission from May 18-26, 1969.
It became synonymous with Snoopy and Charlie Brown in the minds of the public, because the three-man crew named their lunar and command modules after the iconic cartoon characters.
"NASA developed a relationship with Charles Schulz, who drew Peanuts," he explained.
The names were said to have caused some consternation among NASA management, which felt they lacked sufficient gravitas -- accordingly, "Eagle" and "Columbia" were chosen for Apollo 11.
The Apollo 10 crew could have been chosen to land on the Moon, but for the fact that NASA had not shaved enough weight off their lander at the time, added Stafford.
Of course, they couldn't actually see it until they were upon it, because it was eclipsed by the Earth on their trajectory.
"Kind of a buggy feeling -- you're going somewhere you couldn't see," he said with a laugh.
'Keep things simple'
Stafford says that he remains struck to this day by the sheer size of the boulders they witnessed in some of the Moon's craters, which he compared to modern-day stadiums like the Superdome in New Orleans.
On the return journey, the Apollo 10 crew achieved a speed of Mach 37 (about 25,000 miles per hour) as they entered Earth's atmosphere -- a record which still stands.
Stafford's advice for missions returning to the Moon and heading for Mars are two-fold.
"Number one: keep things as simple as possible" as complexity magnifies the risk, he said.
Secondly, he suggested involving astronauts with the development from the get-go, as was done with the Gemini and Apollo programs -- "not somebody saying, 'Here's a spacecraft, go fly it.' It doesn't work that way."
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