The use of Microwave frequencies enables high gain antennas to beam the signal back to base where even more powerful ground based antennas reject cosmic noise and background noise generated by the Earth itself.
Satellites are regularly launched into Earth orbit to provide TV signals, communications services, geographic location services or to scan the planet for geological data. Some are sent to investigate neighboring planets, which just like those on timeless missions into remote corners of our solar system send data about their...
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