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Nicolaus Copernicus developed the Heliocentic theory. He proposed that the earth and other planets revolve around the sun. The Catholic Church opposed this theory.

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Johannes Kepler built off of Copernicus's theory that planets revolve around the sun. Kepler proposed that instead of revolving in perfect circles, planets revolved in ellipses. The Catholic Church also opposed this theory, but not as much as the Heliocentric theory.

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Galileo used a telescope that he made himself to prove the Heliocentric theory. He wrote Starry Messenger, and the Catholic Church put him on an Inquisition Trial. He lived the rest of his life on house arrest.

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William Harvey figured out how blood circulates. He wrote down these findings in a book and published it. Surprisingly, the Catholic Church did not oppose this.

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Sir Isaac Newton discovered gravity. He discovered it when an apple fell on his head. He also made the laws of motion and mathematics.

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Francis Bacon developed the scientific method. The scientific method is a way to conduct experiments.