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revolving, Earth, stars, geocentric, universe, plantrerary.
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heliocentric, Sun, astronomy, mathematician, revolution, scholar.
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astronomy, mythologies, comets, measuring, supernova, orbit.
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telescope, astronomy, thermometer, space, sun, stars
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astronomy, contemporary, mathematician. planetary, heliocentric, motion.
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Galileo
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gravitation, light, motion, laws, waves, reflecting
