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

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://en.wikipedia.org/wiki/Orbital_station-keeping http://www.msnbc.msn.com/id/17630218/ns/technology_and_science-space/t/space-station-sinks-new-low-its-ok/ http://www.msnbc.msn.com/id/17630218/ns/technology_and_scien...