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Not only has Mike Massimino been in to space three times, he's also completed two space walks totaling more than 14 hours - so he's seen the earth from a fair distance.
It also means he's one of the most qualified people on the planet to confirm that the planet is well and truly round - not flat, like certain sub-sections of society might want you to believe.
Speaking to LADbible, New York native Mike said: "I really don't have anything to say [to flat earthers]. I don't understand them.
"I think that they should call up their elementary school high school teachers and ask them what happened? Because they must have missed something. So I really don't understand that at all actually."
When asked if he'd spoken to any of the flat earth crew face to face, he said he 'tries to avoid it'.
He added: "I get it all the time. I speak to a lot of high school students that say that. Luckily, when I speak to these high schools, usually the teachers are there too.
"And I'll ask for a science teacher to talk to them, as that is a problem with their education and understanding. It is - I don't understand that."
You might recognise Mike. The 57-year-old professor is not only basically a genius, he's also multi-talented and is a TV personality.
He's starred in The Big Bang Theory, and if - like most of us - you watched the SpaceX launch two NASA astronauts into space, you may have seen him giving a bit of background to the whole thing, as he watches two of his friends head off on their mission.
Elon Musk's company, SpaceX is paving the way for space exploration. Just two days ago he put another 60 satellites into space as part of the Starlink project.
And now a private company has started exploring space, it's really paving the way for others - in fact, Mike says it's a completely realistic expectation to see space tourism take off (geddit?) in the next 100 years at the very least.
Mike explained: "I think a lot of these things have been dreamed about for a long time. I did some work with Hilton Hotels and they launched cookies into space last summer. I was doing some publicity for them and found out that Hilton wanted to build a first hotel chain in space years ago, going back, when we were going to the moon.
"There was a hope that the space shuttle would come like a commercial spacecraft that airlines would run, you know, British Airways or Virgin Atlantic or United or Delta Airlines would have their own space shuttle. But that never happened.
"We think our dreams were there, but the technology was was not there yet.
"And now I think the technology is there for a lot of this stuff. What was amazing about that launch, I think it's a look into the future. It was an incredible achievement and it's going to open up these possibilities.
"So I think we're really at the beginning of what's going to work in all these games that we've had about hotels, tourism, and making movies in space in general is getting a chance to go.
"All the things that we've dreamed about for so many decades now. I think we're we took a really big step toward making all those dreams happen."
And Mike also let us into which space movies are his favourite, explaining that they are important because they help us to 'dream big' about what is possible.
He continued: "I think the most accurate one I've ever seen is Apollo 13. Which was based on fact. Yeah, so that is very, very accurate. Interstellar was kinda interesting.
"I mean, it was kind of more of a science fiction story, so I thought that was good. I pretty much like all of them. I thought First Man - the one about Neil Armstrong was very accurate. The Right Stuff was pretty accurate based on Tom Wolfe's book.
"Gravity was very accurate in the way the Hubble looked and the tools in the spaces and all that was very, very accurate - but it's a movie.
"All of them, I think, inspire people to dream big and also to learn about certain things. So I pretty much like all of them."
Space Launch: America Returns To Space premieres 8pm, Saturday 6 June on Discovery Channel.
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