Uh, yeah, pretty easy to prove that the Earth is round. I already posted that
here and
here and
here and
here and
here.
It's not just that there's literally millions of us who can do the basic calculations to determine feasibility. It's that you have to believe that tens of thousands of people in NASA who planned it out are in on the conspiracy, and that millions of experts around the world from every country on Earth are caping for them.
You don't think ONE person working for NASA is ever coming out and saying, "It was all fake! My calculations showed that X part of the project was impossible! We never did it!" No deathbed confessions, no drunk reveal-alls, just the most tightly-kept conspiracy in history?
Nixon couldn't even get seven guys with enormous personal interest to keep their mouths shut about a simple break-in, yet you think thousands and thousands of people have a perfectly air-tight lid around the fake moon landing.