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He would become an astronomer and a priest. Heliocentric theory.
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His 95 thesis started the Protestant Reformation which would become one the single most important events in the development of the world as we know it today.
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The voyage was to prove whether or not the Spice Islands were actually a property of Spain.
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He proposed that epidemic diseases are caused by spores that can be spread from short or long distances
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His theories about pulmonary circulation led to many further adv ances on the subject and the saving of many, many lives.
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Change from the Julian calendar to our modern day Gregorian calendar
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He made money from his telescopes. He could sell them to rich merchants. He was also the first to observe Jupiters moons.
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Galileo wrote this book to argue with many teachings of Aristotle and other such scientists.
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His adavnces in astronomy were shown in this book with a star catalogue and planetary tables
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Calculus is an important branch of math which is still studied today by many people.