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Using a telescope that he made himself, the Italian astronomer Galileo Gali (1564-1642) showed that the sun was not a perfect form, as Aristotle had written.He used a telescope to support Copernicus's theory that the earth was a planet orbiting the sun.

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Nicolaus Copernicus (1473-1543) argued that the earth was a planet that revolved around the sun.Copernicus's model for the solar system is called the Heliocentric system.

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English doctor Willam Harvey (1578-1657) published a study that showed how blood circulates through the body and explained how the valves of the heart function.Harvey focused on his research on the works of blood flow inside the body of a human.

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Johannes Kepler discovered that the planets traveled in stretched out circles called ellipse.He found out that the planets speed changes when it goes around the sun.

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English physicist Sir Isaac Newton (1642-1727) proposed that there was a force gravity that pushed all objects to one another.His second law, the law of motion is force, mass, and acceleration with an math equation F=ma.

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Prove hypothesis with scientific experiments.The scientific method is a type of process that requires knowledge and involves making observations.