The son of a musician, Galileo Galilei (1564-1642) tried at first to enter a monastery before engaging the skills that made him the foremost scientist of his day. Though he never left Italy, his inventions and discoveries were heralded around the world. Most sensationally, his telescopes allowed him to reveal a new reality in the heavens and to reinforce the astounding argument that the Earth moves around the Sun. For this belief, he was brought before the Holy Office of the Inquisition, accused of heresy, and forced to spend his last years under house arrest.