On Earth, gravity is fairly consistent, but our perception of it is not. People are better at judging how objects fall when they are sitting upright rather than lying on their sides, according to research published in the journal PLoS ONE in April 2011. The discovery implies that our perception of gravity may be based less on visual cues of gravity's true direction and more on body orientation. The findings could pave the way for new strategies to assist astronauts in dealing with microgravity in space.