I have to admit that I like her better with gravity.
They work by making an airplane to follow a parabolic flight path. The airplane first climbs at 45 degrees, reducing thrust and leveling the plane, then diving down. The sense of zero gravity lasts for about 25 seconds. The airplane makes these parabolas one after the other, like a roller coaster, which eventually causes many people to vomit—hence the nickname for the airplanes used for this kind of training: Vomit Comet.
I wonder if Kate vomited too... ok, nobody is paying attention to any of this now. If this is not enough science for you, go to Sports Illustrated to watch the rest of the images and more videos.