How does a geostationary orbit decay as atmosphere drag is not present?
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Orbits do not decay without some friction-like mechanism which transfers energy from the orbital motion. ... Due to atmospheric drag, the lowest altitude above the Earth at which an object in a circular orbit can complete at least one full revolution without propulsion is approximately 150 km (90 mi).
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All geostationary satellites are geosynchronous. ... The “stationary” part of geostationary describes how a satellite in this orbit remains fixed with respect to an observer on the ground. This is an ideal orbit for communications satellites, since ground-based antennas can remain pointed at the same spot in the sky.
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