Mission: Space is an excellent ride that uses a unique technology (centrifuge) to spin your car and create G-forces that simulates a rocket lifting off. The trick to not becoming sick on Mission: Space is to KEEP YOUR EYES OPEN and focus strait ahead in the "window" (which is actually a video of the lift off synched with the spinning) It confuses your mind and inner ear (which controls balance) into experiencing forward/vertical movement. Closing your eyes or turning your head will disturb this process and allow you to really feel the spinning. (Boy is it fast!) In the summer of 2003 I had the opportunity to test ride Mission: Space and found it to be pretty intense. I did feel sick afterwards. I rode it again this summer and found that it has been made much less intense and I do not feel in anyway affected after the ride. The ride cannot really be compared to star tours or anything else. I recommend trying the ride and making sure to keep your head back against the headrest and you eyes open while focusing all your attention forward. If you really try to believe you are flying, or focus on hitting your buttons for the mission, you will probably not notice the spinning.
This is my favorite ride at WDW and I'd hate for someone to miss it because of a bad experience on star tours or body wars.
ohh, its about 10 times smoother than star tours/body wars, you dont get rocked around, its very smooth.
Drew