This book is part of the "Makers of the Middle Ages and Renaissance" series. The text presents the facts but also draws the reader in and captures the enthusiasm and inquisitive mind of Galileo. His life was often difficult as he challenged accepted theories and his professorial career suffered, but his imagination and intellect kept him pushing ahead with his experiments and inventions. He often wrote in simple terms and angered the intelligentsia by writing in Italian, the common language among the people, rather than Latin. Galileo's development and improvement of the telescope enabled him to demonstrate his controversial theory that the Earth was not at the center of the solar system. The reaction of the Catholic Church is covered, including the later move to acknowledge that the Church had been in error when they reacted to his publications. Each chapter is followed by questions, and the book includes a chronology and timetable, as well as a listing of books and Web sites for further research.