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inventor, geocentric universe, treatises, astronomer, moon
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heliocentric, heliocentric model, controversial, theory, initiator
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colorful character, tychonic system, supernova, mathematician
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astronomer, mathematician, military compass, heliocentric, venus
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laws, elliptical, heliocentric, gravity, distance, books
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Hans Lippershey invented the telescope
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influential, calculous, telescope improvements, gravity, distance
