A satellite is any artificial body made by man and placed in orbit around the Earth or any other planet. Today, contrary to what occurred in the early history of artificial satellites, the word satellite has been used almost as a synonym for "artificial satellite". This term has been used when either distinguí them of natural satellites, as the moon.
Currently are in orbit, in addition to the satellites of the Global Positioning System (GPS) satellites for communications, scientific satellites, military satellites, among others, and a large amount of space junk, or should not refer to only satellites as a means of transport of data or only a means spy the earth system.
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