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He accurately measured the circumference of the Earth
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Ptolemy discovered that the Earth was the center of Universe also known as the geocentric view.
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Copernicus discovered that the sun is actually the center of our Universe and not the Earth this known as the heliocentric view.
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He was the assistant of Johannes Kepler, he discovered the irregularities in the Moon's orbits
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Bacon was an influence to the scientific revolution by developing the scientific method and Empiricism.
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Galileo made a telescope to observe our Solar System, one of his observations was identifying the four moons of Jupiter
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Descartes influenced people that, if it can't be proven then it must not be true which is also known as Descartes skepticism.
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Kepler discovered the planetary motions of our planets in the Solar System.
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Locke came up with the idea that knowledge is all obtained throgh experience.
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Newton defined our laws of gravity and motion, he also broke down the idea of prisms and light.
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Mendeleev organized the structure of the periodic table by the element atomic mass and similarities.
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Marie Curie discovered 2 known elements of the periodic table, radium and polonium.
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Discovered that the continents used to be connected also known as Pangea.
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Hubble and his research proved that the Universe was still expanding and will continue to expand.
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He discovered that magma contributed to the continental and plate tectonic drift.
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Leavitt was an astronomer who observed stars and their luminosity.