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How Did Galileo Observe The Night Sky

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Before Galileo Galilei observed the night sky with his telescope the universe was perfect. Galileo was a brilliant mathematician and became a professor at the University of Pisa when he was 25 years old. He became entangled with the cosmos when he was required to teach an astronomy class. He lectured on Ptolemaic astronomy, which placed the earth at the center of the universe with the planets and sun moving around it. As he became more familiar with the subject he began to move more towards the Copernican theory of a heliocentric universe, which had the earth and other planets revolving around a stationary sun. In 1604, a supernova brought Aristotle’s theory of the unchanging heavens into question and caught a now 40-year-old Galileo’s
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