I would add one. In space everything has gravity. In fact everything has the same gravity as earth. I've gotten tired of seeing science fiction movies where all space ships have gravity. Even small ships like the Millenium Falcon has so much gravity you can walk around and play games just like its on earth. I think 2001, a Space Odyssey, did a great job in creating a rotating space station so that it would have gravity (OK, its centripetal acceleration). Also, what about the fact that Mars has 1/3rd to gravity of earth. That would totally change movies like Total Recall. So I would like to see, for once, a sci-fi movie where gravity is an issue!