Satellite usually a communications satellite relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.

Satellites are used for television, telephone, radio, internet, and military applications. There are 2,134 communications satellites in Earth’s orbit (2016), used by both private and Government Entity organizations. Many are in geostationary orbit 22,200 miles (35,700 km) above the equator, so that the Satellite appears stationary at the same point in the sky, so the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track it.

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