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

Newton's First Law of Motion -- "An object will retain it's state (in motion or at rest) without external input of energy." If you place an object into an orbit, it will remain in that orbit forever with no further "boost" required unless something saps its energy, such as acceleration from opposing gravitational pulls or, with lower orbits, atmospheric drag. If the earth orbit is high enough there is no significant atmospheric drag. If the orbit is lunar or heliocentric the object could orbit for a very long time before gravitational perturbances affected its orbit. Snoopy, the Apollo 10 Lunar Module, is somewhere out there orbiting the Sun since the late 1960's.

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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.

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

Thank you for the explanation!

Edit: and you made me go lookup Snoopy!