This film reveals the technological leaps forward that have enabled the world's biggest space station – the International Space Station – to be built. The International Space Station orbits 200 miles above our heads, hurtling around the Earth at 17500 thousand miles an hour. It is one of the greatest engineering feats of all time. Its crew performs vital experiments that will one day allow humans to live permanently in space. A test bed for future missions deeper into space, the space station could enable future generations to journey throughout the Solar System or even live on Mars.