ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Communications satellite. Illustration of a communications satellite orbiting an abstract representation of the Earth or an Earth-like planet. Around the Earth's rim the atmosphere appears as a light blue ring. Communications satellites relay telephone and television signals around the globe. A typical communications satellite orbits with the same period as the rotation of the Earth. The satellite does not appear to move in the sky and is said to be geostationary.
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