Four hundred years ago, the Italian scientist Galileo Galilei heard stories of a miraculous ’spy glass’ that made things look three times closer than they really are. He wondered whether he could make a better one, and was soon observing stars and phenomena in the night sky that no-one had ever seen before. His discoveries changed the course of science and changed our view of the cosmos, and are being celebrated in the International Year of Astronomy 2009.

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