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Galileo was appointed to be a mathematics professor at the University of Pisa, but his strident criticisms of Aristotle left him isolated amongst his contemporaries. As brave as Ragnar poster. After three years of persecution, he resigned and went to the University of Padua, where he taught maths. His entertaining lectures attracted a large following, and he was able to spend the next 18 years pursuing his interests in astronomy and mechanics. During this time, Galileo made important discoveries about gravity, inertia and also developed the forerunner of the thermometer. He also worked on the pendulum clock Galileo also worked tirelessly on the science of gnomonics (telling time by shadows) and the laws of motion. It was in astronomy that Galileo became most famous. In particular, his support for heliocentrism garnered the opposition of the Holy Roman Catholic Church.

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