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planetary, egypt, astronomer, geocentric, intelligent, theory
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heliocentric, mathematician, astronomer, renaissance, revolution, book
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founder, observational, instruments, measurement, apparatus, methods
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telescope, astronomy, thermometer, inventor, modify, gravity
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astronomy, contemporary, laws, planetary motion, mathematician, heliocentric
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Galileo invented the telescope. Galileo was the first to use a telescope for the purpose of astronomy in 1609.
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gravitation, laws, calculus, light waves, reflecting telescope, colors
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