I hate to tell you this but if Star Tours makes you sick, Mission Space will probably do the same. I have moderate to severe motion sickness and MS made me feel sick as a dog. Didn't truely feel right til the next day. Star Tours makes me nauseous, but not usually severely. You may be okay, not everyone with motion sickness reacts the same way to MS. I've seen it trigger problems with people who don't get motion sickness, and others who do ride it successfully. If spinning rides make you sick then I think that MS would more likely get you sick. If you ride I suggest you take whatever medication works for you(dramamine, bonine, etc...) and follow the instructions religiously-keep you head back and look straight ahead. I'd also try it later in the day, both myself and others have been sick for the remainder of the day after riding it, which is NOT usual for me with motion sickness. Try eating something a few hours before, both empty stomachs and very heavy meals can aggravate motion sickness. I'm going to try MS one more time, this time I'll premedicate and say a prayer to whatever gods are listening. I really like MS too, I'm a thrill ride junkie and it's a heckof a ride.