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The ISS is constantly falling, by about 90 metres a day. They have to periodically boost it back up to a higher orbits. And pretty much everything up there is actually falling all the time and would come down without corrective action.

http://en.wikipedia.org/wiki/Orbital_station-keeping http://www.msnbc.msn.com/id/17630218/ns/technology_and_scien...



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