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postulated. published in 1632. The book became another attack on the church's idea that the Earth is composed of a totally different kind of matter from that the heavens. Galileo reconciled the Earth's motion with man's experience in everyday life. He set forth the concept of the relativity of motion, inertia, and the notion of composition of independent motions. The Dialogue basically rejected current astronomy and physics and most of the prevailing philosophy. The book was printed with the church's authority, and Galileo felt he had truly made some progress against the old world thinking. However, within five months time the church changed its position on his book and called Galileo to Rome to explain himself. His old friend, the Pope, was no longer friendly; he became outraged that Galileo was continuing to undermine the authority of the church and trying to change the thinking that they had Galileo was ordered to stand trial, and although he fought gallantly, he lost to the unreasoning Pope, who would not listen to his arguments and sentenced him to life imprisonment. All copies of The Dialogue were ordered to be burned, and all universities were forbidden to read or sell any of Galileo's books. The church was outraged and was not ready to release it hold over the minds of men. Galileo's sentence was quickly commuted to house arrest, and he was put under the responsibility of the Archbishop of Sierna. He was later allowed to return to his home at Arcetri in the hills above Florence. At first he was crushed and did not know what to do with himself. But he soon found solace in being allowed to write on noncontroversial physics. Not willing to give up and give in to the church, Galileo smuggled The Dialogue out of Italy, and it was eventually printed in Latin and English. The book was re- titled and called Discourses and Mathematical Demonstrations Relating to