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Earth, Astronomy, Ptolemaic, Universe, Center, Summary
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Scientific Revolution, Mathematician, Artist, Sun, Doctorate
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Scientist, Measurement, Sextant, Space, Religious, Copemicus
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Mechanics, Jupiter, Professor, Philosophy, Rate, Moons
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Earth, Sun, Moon, Habitable, Elliptical, Telescope
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Newton, Motion, Inertia, Equal, Gravitation, Cooling
