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on May 17th 2009, 22:41:16, stargazer* wrote the following about

telescope

Four hundred years ago, in 1609, Galileo Galilei made his first telescope and turned it to the night sky. In January, 1610, he discovered four moons of Jupiter: Io, Europa, Callisto, and Ganymede.

The International Year of Astronomy is being celebrated in 2009 to honor both this event and the publication of _Astronomia nova_ by Johannes Kepler the same year.
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