Introduction Since ages Space have been a mysterious and interesting subject that we human beings only could stare at, until the development of the telescope all astronomical observations were made with the eye. By using measuring instruments, astronomers documented the positions of the planets against the background of stars. In 1609 Galileo Galilei turned his telescope to the sky and expanded the whereabouts of science; planetary astronomy became a new and different science, moreover, the concerns about the motions of planets, surfaces of other worlds could now be studied as well. The tele...

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