Satellites-the original Latin word means 'bodyguards' -have different tasks. Some, like the METEOSAT, observe the weather, and others, like the SEASAT, measure temperatures on land and sea. There are also Earth-monitoring satellites, which monitor air and water pollution, and spying satellites, which can watch the goings-on in any country under focus. There are also television satellites, which transmit news from all parts of the world to out homes. There are also natural satellites, the moons of the planets-the moon we see in the night sky is one of them.
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