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Nowadays, there is an increasing number of man-made earth satellites in space, with their respective functions. For instance, communication satellites transmit wireless communication signals and bring people in different parts of the world into contact and mutual understanding； Meteorological satellites send data and photos of weather conditions to meteorological earth stations and apprise people of the latest developments in climate; scientific research satellites are used in experiments and studies to decipher themyths of Nature and space; military satellites execute various tasks and help maintain peace. Therefore, all sorts of satellites are very useful and importance to us.