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Falcon 9’s first stage is equipped with hypersonic grid fins which manipulate the direction of the stage’s lift during reentry. The fins are placed in an X-wing configuration and are stowed on ascent and deployed during reentry. While the fins are relatively small – they measure just 4 feet by 5 feet – they can roll, pitch, and yaw the 14-story stage up to 20 degrees in order to target a precision landing.