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 Message and 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.