That's what I've been thinking for awhile. I mean, don't quote me on this, but I think someone already proposed that; that the space station is just an airplane or something with screens for windows that make it look like you're in space. Never mind the fact that the plane would have to be diving toward the ground nonstop for months on end to simulate zero gravity for so long.
You know, come to think of it, maybe some of the smarter ones would be able to acknowledge they were wrong. What you gotta do is talk beforehand and get them to agree that there is no way that they could experience zero gravity for days on end unless they're orbiting the round earth.