Galileo demonstrates one of his telescopes to the ruler of Venice in August 1609 (Galileo is standing to the right of the telescope) (Image: Science Photo Library: from by Govert Schilling and Lars Lindberg Christensen)
In celebration of the International Year of Astronomy in 2009, New Å®ÉúСÊÓƵ takes you on an armchair tour of some of the most important telescopes ever built.
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