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[–] CarlosShyamalan 0 points 1 point (+1|-0) ago 

The thing is just that space around earth really isnt a complete vacuum. The remaining particles slow down sattelites depending on how close they are to earth. LEO ones only have a lifespan of maybe a few hundred years (not sure about that) while the ones in geostationary orbits much farther away are estimated to last billions of years until they crash down to earth.