The International Space Station weighs almost 400 tonnes and covers an area as big as a football pitch. It would have been impossible to build the Space Station on Earth and then launch it into space in one go – there is no rocket big enough or powerful enough. To get round this problem the Space Station was taken into space piece-by-piece and gradually built in orbit, approximately 400 km above the Earth’s surface. This assembly required more than 40 missions.
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