Most Important Satellites
Whether you realize it or not, you have likely used one or more satellites today. If you checked a weather report, watched CNN, or looked up directions on Yahoo Maps, you used one of the automated satellites orbiting the Earth hundreds of miles above your head.
Modern satellites are used for astronomy, communications, GPS, imaging, research, weather, and of course spy and military applications.
io9 has compiled a list of the most important satellites that make our modern life possible.
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