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Docking in orbit is harder than it appears. Speed and altitude are linked so you can't just thrust towards the station or you will wind up in a different orbit:

http://en.wikipedia.org/wiki/Space_rendezvous#Methods_of_app...



Dragon doesn't autonomously dock. It flies within range of the space station's robotic arm, is grappled, and then is slowly berthed to a docking port.




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