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Television, system of sending and receiving pictures and sound by means of electronic signals transmitted through wires and optical fibers or by Electromagnetic radiation. These signals are usually broadcast from a central source, a television station, to reception devices such as television sets in homes or relay stations such as those used by cable television service providers. Television is the most widespread form of communication in the world. Though most people will never meet the …

…use of television helped in the development of photosensitive camera lenses and more-sophisticated transmitters that could send images from a quarter-million miles away. Since 1960 television cameras have also been used extensively on orbiting weather satellites. Video cameras trained on the earth record pictures of cloud cover and weather patterns during the day, and infrared cameras (cameras that record waves radiated by warm objects instead of light waves) detect nighttime temperatures. The ten Television Infrared Obs