Why doesn't an orbiting sat elite fall back to earth?

Why doesn't an orbiting sat elite fall back to earth?
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1 Answer

Answer :

It's travelling forward through space at sufficient speed tobalance out the effects of gravity. Either that - or it'ssufficiently far enough from Earth that gravity cannot pull it backto the surface. Here's two examples.. a TV satellite and the GPSnetwork.In the case of a TV satellite - it needs to 'follow' therotation of the Earth - so that it keeps transmitting TV to thesame area on the planet. TV satellites are in low orbits - and thusneed to move fast enough to stop gravity pulling them back toearth.For the GPS network - the satellites need to remain stationaryin orbit - in order for accurate data to be received by devices.The GPS satellites need to remain in a static position - and thusare orbiting far enough from the Earth that gravity doesn't affectthem.
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