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According to the United Nations Office for Outer Space Affairs (UNOOSA) Index of Objects Launched into Outer Space, there are 4,921 satellites currently orbiting. But not all of them are active.

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"Satellite orbit around the Earth performs a multitude of functions including communications (cell phone coverage and data transfer), Earth observation, and navigation. Science's study of space and the planet," describes the specialist.

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Some satellites serve scientific purposes; others allow observations, some are used for military and espionage purposes, and some are used to improve telecommunications.

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The space age began on October 4, 1957 with the launch by the Soviet Union of the world's first artificial satellite, Sputnik- 1.

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"Yes, today it is possible for almost anyone to send satellites into space. Even high school students have built and launched their own satellites sharing programs with launch vehicles and various government agencies around the world."