Hmm.. the only way you can simulate weightlessness is with a big drop. It's probably going to resemble one of those big drop rides you see at a amusement park. I have to say if there is any imax movie I recommend you see is one about the space station. It was amazing. Plus me and my mom were pointing out the little stuffed animals floating around the space station. It was also scary imagine watching in 3-d a liftoff of a Russian spacecraft from a short distance away. I was ducking because it felt so real.