"have a friend who believes the earth is flat and that traveling to space is just junk and crap and scam"
I guess I and your friend are in the same believe. I believe travelling to space is scam and come to think of it, is it possible to even think of traveling to space?
I can actually accept people to believe it, but there are so many questions coming to my mind when I hear about that. How do satellites work if there is so no space and satellites moving around the earth? And so on... But, I guess I am limited by my own paradigm and way of thinking.