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Galileo's Early Life , Education and Experiments . Galileo Galilei ____________________ born in Pisa in 1564 , the first of six children of Vincenzo Galilei , a musician and scholar . In 1581 he entered the University of ____________________ to study medicine , but was soon ____________________ by ____________________ . In 1583 he made his first important discovery , describing the rules that govern the motion of ____________________ . Did You Know ? After being forced during his trial to admit that the Earth was the ____________________ center of the ____________________ , Galileo allegedly muttered ( " Yet it moves ! " ) . The first direct attribution of ____________________ quote to Galileo dates to ____________________ years after the trial , though it appears on a wall behind him in a 1634 Spanish painting ____________________ by one of Galileo's friends . From 1589 to 1610 , Galileo was chair of mathematics at the universities of Pisa and then Padua . During those years he performed the experiments with falling bodies that made his most significant contribution to physics . Galileo , Telescopes and the ____________________ Court In 1609 Galileo built his first telescope , improving upon a ____________________ design . In January of 1610 he discovered four new ? stars ? orbiting ____________________ ? the planet's four largest ____________________ . He published a ____________________ treatise outlining his discoveries , ? Siderius Nuncius ( ? The Starry ____________________ ? ) , which also contained observations of the moon's ____________________ and descriptions of a ____________________ of new stars in the ____________________ ____________________ . In an attempt to gain favor with the l grand duke of Tuscany , Cosimo , he suggested Jupiter's ____________________ be called the ? Medician ____________________ .