Satellite is the word used to call a object that revolves around another thing. Satellites can originate from nature like moons, planet, stars…, or be made by human. Not so long ago, man-made satellites were exotic and top-secret apparatuses because they were used in military for navigation and espionage. Nowadays, satellites become more popular and crucial because of their useful. The Sputnik is the first satellite which was launched into space by the Soviet Union. We need enough velocity to send a satellite into space to orbit the Earth, for example more than 23,500 mph. The satellites can collect sun energy through bartery-like fuel cells on their wing-like solar panel. There are two kinds of satellite, polar orbiting satellites (television, communications, and weather satellites) and fixed satellites.


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