First satellite sputnik 1 was being sent into the orbit in 1975 by soviet union.after that thousands of satellite sent in space.where they are controlling through computers.different program send through computers and they receive through cabels and we can see the program on different channels.there are different satellite in space e.g. Communication satellite,weather setellite,navigation satellite,research satellite
5/10
Grammatical errors which will not be tolerated in the exam.