When The Sun Stands Still: Kepler, Galileo & The Heavens

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It was 400 years ago that Galileo Galilei opened the window to the skies with a telescope. In 1609 Johannes Kepler published his "Astronomia Nova" and in the proces s provided us with a new understanding of our solar system. To commemorate these scientific milestones, the UN declared 2009 the "International Year of Astronomy."