His astronomical discoveries were based on the Copernican system, and in four letters he tried to show that the theory of the Earth's movement around the Sun was not in opposition to the Bible. Copies of these letters were circulated and provoked violent attacks against him, so that he was finally denounced to the Inquisition. On Galileo's next visit to Rome, the Holy Office announced a censure against the Copernican system in 1616, and stopped Galileo from teaching, defending, or even discussing it. Afraid of imprisonment, Galileo agreed.

The telescope had been invented in Holland about 1608, and the following year Galileo made himself a small instrument with a lead tube. In August 1609 he showed it to the Doge of Venice and other powerful people from the top of the St. Mark's Cathedral. The enthusiasm shown by the Doge was enormous, and Galileo received an additional salary.

Some common words found in the essay are:
University Pisa, Mark's Cathedral, Marina Gamba, Holy Office, GALILEO Galileo, College Rome, Sidereal Messenger, Bible Copies, Pope Paul, Duke Tuscany, professor mathematics, copernican system, university pisa, galileo received,
Approximate Word count = 595
Approximate Pages = 2 (250 words per page double spaced)