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Nicolaus was known for developing the Heliocentric Theory. He argued that the Earth was the planet that revolved around the Sun. Copernicus's model for the solar system is known as the Heliocentric model.

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Johannes discovered that the planets travel in stretched-out circles called ellipses. He is very well known for his three laws of motion. His laws described how planets orbit the sun in not a perfect circle.

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He is known for making his own telescope. He used that telescope to show that the sun was not a perfect form. He used that telescope to support Copernicus's theory.

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He published a study to show that blood circulates through the body. explaind how the valves of the heart function.

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He proposed that there was a force of motion that attracted all objects to one another. The laws of motion help in a subject known today as calculus. He found all this out from an apple falling from an apple tree.