In the United States, 21 million people believe that the moon landings were faked – despite pictures from Nasa space telescopes clearly showing flags left by the Apollo missions.
This week, Formula One champion Lewis Hamilton asked astronaut Doug Hubley directly if the landings were faked.
He said, "I guess it's a touchy point, but the big question is ... there's the theories that you didn't land on the moon. So... why would people have that theory?", Jalopnik reported.
Hurley said that it would been harder to fake the landings than to actually do them.
He said, "I've always maintained that it would've been harder to fake it and hide it.
"It just takes one person to spill. ... I had people in my own family that thought we faked it and then they came and watch me go fly in space."
The idea that the moon landings were faked actually came from rocket expert, Bill Kaysing, a technical writer who self-published a book called We Never Went to the Moon: America's Thirty Billion Dollar Swindle.
The Prince of Wales talks to 14 year old Lewis Hamilton who is sponsored by Mclaren's driver support programme during his visit to McLaren's Formula One factory in Woking.
Lewis Hamilton (GBR) ART
Felipe Massa (right) celebrates claiming Pole position with second placed Lewis Hamilton during qualifying at Magny Cours, Nevers, France.
Prime Minister Gordon Brown talks to Formula One World Champion Lewis Hamilton at the British Racing Drivers Club Awards, at the Cafe Royal, Piccadilly, London.
(left to right) Nigel Mansell, Formula One World Champion Lewis Hamilton, and Damon Hill at the British Racing Drivers Club Awards, at the Cafe Royal, Piccadilly, London.
Great Britain's Lewis Hamilton is loaded onto a helicopter following his crash during a qualifying session for the European Formula One Grand Prix at Nurburgring, Germany.
David Coulthard (centre) with Lewis Hamilton and Jenson Button at Interlagos, Sao Paulo, Brazil.
Lewis Hamilton drives Olympic cycling champion Chris Hoy round the track in a Mercedes SLR 7722 during the Race of Champions at Wembley Stadium, London.
Great Britain's Lewis Hamilton celebrates after finishing in pole position at Silverstone, Northamptonshire.
Mercedes Lewis Hamilton in the pits during Practice Day for the 2013 Santander British Grand Prix at Silverstone Circuit, Towcester.
McLaren's Lewis Hamilton in the garage during third practice at the Catalunya Circuit, Barcelona.
McLaren Mercedes' Jenson Button of Great Britain and Lewis Hamilton of Great Britain in the pits during Second Practice Session during Practice for the Formula One Santander British Grand Prix at Silverstone Circuit, Northampton.
Great Britain's Lewis Hamilton celebrates his victory with his brother and his father during The Monte Carlo Grand Prix, Monaco.
Winner of Sports Personality of the Year 2014, Lewis Hamilton, second placed Rory McIlroy (right) and third placed Jo Pavey (left)during the 2014 Sports Personality of the Year Awards at the SSE Hydro, Glasgow.
Nicole Scherzinger and Lewis Hamilton arriving at the British Fashion Awards 2014, the Colosseum Theatre, London.
Nico Rosberg and Lewis Hamilton unveil the new Mercedes W06 during pre-season testing at the Circuito de Jerez in Jerez, Spain.
(Left - right) Lewis Hamilton, Rita Ora, Graham Norton, Ewan McGregor and Jack Whitehall during filming of the Graham Norton Show at the London Studios, south London, to be aired on Friday.
File photo dated 10-07-2016 of Lewis Hamilton celebrates his victory with the crowd after winning the 2016 British Grand Prix at Silverstone Circuit, Towcester.
Lewis Hamilton asks NASA astronaut whether the moon landings were faked
LONDON, ENGLAND - DECEMBER 04: (L-R) Singer Rita Ora, F1 Driver Lewis Hamilton, designer Donatella Versace and MMA Fighter Connor McGregor are seen at The Fashion Awards 2017 in partnership with Swarovski at Royal Albert Hall on December 4, 2017 in London, England. (Photo by John Phillips/BFC/Getty Images for BFC)
ALBERT PARK, VIC - MARCH 17: Mercedes-AMG Petronas Motorsport driver Lewis Hamilton (44) holds up the second place trophy at The Australian Formula One Grand Prix on March 17, 2019, at The Melbourne Grand Prix Circuit in Albert Park, Australia. (Photo by Speed Media/Icon Sportswire via Getty Images)
MELBOURNE, AUSTRALIA - MARCH 17: Lewis HAMILTON of Mercedes-AMG Petronas Motorsport on the drivers parade before the start of the 2019 Formula 1 Australian Grand Prix (Photo credit should read Chris Putnam / Barcroft Media via Getty Images)
Second-placed Mercedes' British driver Lewis Hamilton attends a press conference after the Formula One Australian Grand Prix in Melbourne on March 17, 2019. (Photo by Asanka Brendon RATNAYAKE / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE -- (Photo credit should read ASANKA BRENDON RATNAYAKE/AFP/Getty Images)
17th March 2019, Melbourne Grand Prix Circuit, Melbourne, Australia; Melbourne Formula One Grand Prix, race day; Mercedes AMG Petronas Motorsport, Valtteri Bottas wins first race of the year followed by his team mate Lewis Hamilton (Photo by Octane/Action Plus via Getty Images)
MELBOURNE, AUSTRALIA - MARCH 17: Lewis Hamilton of Great Britain and Mercedes GP, Valtteri Bottas of Finland and Mercedes GP, Sebastian Vettel of Germany and Ferrari and Charles Leclerc of Monaco and Ferrari look on at the F1 Drivers Class of 2019 photo before the F1 Grand Prix of Australia at Melbourne Grand Prix Circuit on March 17, 2019 in Melbourne, Australia. (Photo by Charles Coates/Getty Images)
Lewis Hamilton of Great Britain and Mercedes takes a photo with photographers after taking pole position for the Australian Formula 1 Grand Prix at Albert Park on March 16, 2019 in Melbourne, Australia (Photo by Morgan Hancock/NurPhoto via Getty Images)
MELBOURNE, AUSTRALIA - MARCH 13: Lewis HAMILTON of Mercedes-AMG-Petronas Formula One Team greets fans at the 2019 F1 Season Launch (Photo credit should read Chris Putnam / Barcroft Media via Getty Images)
Mercedes' British driver Lewis Hamilton (R) and team principal Toto Wolff (L) greet fans onstage during an F1 live event to introduce drivers and team principals in Melbourne on March 13, 2019, ahead of the Formula One Australian Grand Prix. (Photo by PETER PARKS / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE -- (Photo credit should read PETER PARKS/AFP/Getty Images)
British driver Lewis Hamilton (L) is pictured in the Petronas Yamaha SRT pit at Losail track in Doha on March 9, 2019. (Photo by GIUSEPPE CACACE / AFP) (Photo credit should read GIUSEPPE CACACE/AFP/Getty Images)
PARIS, FRANCE - MARCH 04: Lewis Hamilton is seen, outside Stella McCartney, during Paris Fashion Week Womenswear Fall/Winter 2019/2020, on March 04, 2019 in Paris, France. (Photo by Edward Berthelot/Getty Images)
PARIS, FRANCE - MARCH 04: Lewis Hamilton and Oprah Winfrey attend the Stella McCartney show as part of the Paris Fashion Week Womenswear Fall/Winter 2019/2020 on March 04, 2019 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)
PARIS, FRANCE - MARCH 04: Lewis Hamilton and Stella McCartney pose after the Stella McCartney show as part of the Paris Fashion Week Womenswear Fall/Winter 2019/2020 on March 04, 2019 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)
PARIS, FRANCE - MARCH 02: (EDITORS NOTE: Image has been converted to black and white) Lewis Hamilton arrives at the Tommy Hilfiger TOMMYNOW Spring 2019 : TommyXZendaya Premieres at Theatre des Champs-Elysees on March 02, 2019 in Paris, France. (Photo by Gareth Cattermole/Getty Images For Tommy Hilfiger)
File photo dated 28-10-2018 of Mercedes' Lewis Hamilton.
PARIS, FRANCE - MARCH 04: (L-R) Stefano Tonchi, Carine Roitfeld, Lewis Hamilton and Anna Dello Russo attends the Stella McCartney show as part of the Paris Fashion Week Womenswear Fall/Winter 2019/2020 on March 04, 2019 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)
Lewis Hamilton and Winnie Harlow attend the 2018 CFDA Awards at the Brooklyn Museum in New York, NY, on June 4, 2018. (Photo by Anthony Behar/Sipa USA)
Discover More Like This
BACK TO SLIDE
Many of the supposed 'giveaways' still touted by moon truthers today come from Kaysing's book, according to author C Stuart Hardwick.
Hardwick says, "The first person to give real voice to moon hoax was Bill Kaysing, a technical writer who had worked for Rocketdyne until 1963.
"Why? It's unclear. He was not obviously insane, but he was obviously unqualified to express the opinions he was expressing. My guess is, technical writing with objective criteria didn't suit him, and pretending expertise to a bunch of ignorant sycophants fuelled his ego."
Kaysing misused his 'expertise' as a technical writer to create the impression the missions were faked, Hardwick says – but ignored any facts that got in the way.
Hardwick says, "He made a large number of idiotic claims that in fact only demonstrated his ignorance and paranoia. For example, he claimed (without evidence) that the mighty F1 engine was wholly unreliable and so Nasa was forced to cover that up by welding clusters of proven B-1 engines inside the F1 engine bell in order to simulate a lunar mission by launching a (presumably mostly empty) Saturn V that could never leave orbit.
"The F1 engines from some of the missions he was talking about (including Apollo 11) have been recovered from the sea floor, and are clearly unmodified F1 engines."