The first entirely new translation of Galileo's major writings for more than fifty years, this marvelous volume includes selections from all of his important writings on science, including virtually the complete text of A Sidereal Messageand a substantial part of his masterpiece, the Dialogue on the Two Chief World Systems. The book contains all of Galileo's contributions to the debate on science and religion, including the letters to Benedetto Castelli and the Grand Duchess Christina, plus key documents from Galileo's trial before the Inquisition. William R. Shea's introduction gives a clear, lively overview of Galileo's career and achievements, and his notes explain the scientific and philosophical background.