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11 February 2020, 12:06 | Updated: 11 February 2020, 12:39
Flatearther Mark Sargent had his work cut out for him as he explained the flat-earth theory to Holly Willoughby and Phillip Schofield.
While humans have known the Earth is round for over 2,000 years, there are many people across the globe who believe that the earth is in fact flat.
One of these 'flatearthers' is Mark Sergent, who explained his theories to a stunned Holly, 38, and Phil, 57, on the ITV show.
Mark told the presenting duo that the earth is not a globe, because "we can't prove it's a globe".
A defensive Phillip told Mark that during a trip on a Concorde, he was able to see the curvature of the earth, asking Mark if he thought he was lying.
Mark told the presenter: "I'm not saying you're lying, I'm saying you wanted to see a curve."
Phillip then went on to question what he thought the visuals from the NASA Space Station, which are available to the public to view.
To this, Mark said that people are looking at CGI, and "nothing more".
Holly took lead with the interview at one point, telling Mark she had spoken to Major Tim Peake from outer space back in 2016 live on This Morning.
Mark told Holly she was talking to a military officer in that interview and "nothing more".
The flatearther believes NASA knew the earth was flat in 1960, but knew the world wasn't ready for the shocking news, however, he believes in 2020 we are.
Mark believes that the world is encased in a dome, so it looks like a sound stage, and that Antartica goes all the way around the earth like an ice wall.
He, and his fellow flatearthers, also believe the North Pole is located in the centre of the flat earth.
Holly and Phil weren't the only people left baffled by the claims, with many viewers taking to Twitter to share their confusion over Mark's beliefs.
One person commented: "STOP IT! #ThisMorning #FlatEarth this is too much. This guy is delusional", while another added: "This flat-earth dude is something else."