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Four hundred years ago on this day Galileo Galilei, considered by some to be the Father of Modern Science, demonstrated his first telescope to the merchants of Venice. In building his first telescope and with his subsequent observations of the moons of Jupiter he set the stage to later argue in favour of the sun-centered Copernican theory of the universe. Unfortunately for Galileo his work and support of the the sun-centered theory would be considered close to heresy by the Catholic church which would eventually try him and place him under house arrest.