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Nicolaus Copernicus developed the Heliocentric theory, he argued that the earth was a planet that revolved around the sun.

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Johannes Kepler discovered that the planets travel in stretched-out circles called ellipses, his work had provided a foundation for Isaac Newtons work.

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Galileo Galilei used his telescope to support Copernicus's theory that the earth was a planet orbiting the sun, he wrote a book called "Starry Messenger", accused of heresy by the Catholic Church and went on trial, under threat of torture and possible death, he made a confession and was able to go home but had to be on house arrest until he died.

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William Harvey published a study that showed how blood circulates through the body, he also explained how the valves of the heart functioned.

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Sir Isaac Newton proposed that there was a force, gravity that attracted alll objects to one another, the laws of motion, and the laws of mathematics-calculus, like gravitation, his laws of motion were universal, the laws of motion salved a wide range of problems in science and engineering.

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Francis Bacon discovered the scientific method, he proved the hypothesis with scientific experiments.