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He was born in Pisa, Duchy of Florence, Italy
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His family moved to Florence, where he started his education at the Camaldolese monastery in Vallombrosa.
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He entered the University of Pisa to study medicine
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He had some financial difficulties, therefore, he left the university before earning his degree.
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He learned about a simple telescope built by Dutch eyeglass makers, and successfully developed one of his own.
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He wanted to test his telescope so he look up to the sky. He observed the moon and found Venus had phases like the moon, proving it rotated around the sun. He also discovered Jupiter had moons that didn’t revolve around Earth.
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He published a book called 'The Starry Messenger', a small booklet revealing his discoveries that the moon is a sphere with mountains and craters.
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He wrote a letter to a student to explain how Copernican theory did not deny Biblical passages.The letter was made public and Church said that the Copernican theory has a opinion opposite to religious belief, therefore should be taken care of.
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We don't know the exact date, but he has proved to the Church that the Sun was rotating and not smooth, the Moon has craters and mountains, the heliocentric theory, Jupiter having 4 moons and more. The Church believed the opposite and decided to not allow him to teach all this.
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He was told to hold of the teaching of the Copernican theory
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A friend of his, Cardinal Maffeo Barberini, was elected as Pope Urban VIII, and told him to teach again as long as he didn't support the Copernican Theory
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Because of the new Pope, he started to argue about the Copernican theory, proving to be correct. It ended in July 1633 when he was put under house arrest.
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Catholic Church puts him under house arrest for 9 years
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He published another book called 'Two New Sciences', a summary of his discoveries on motion and strength.
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Still under house arrest, he died in Arcetri, Italy.