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geocentric, universe, Astronomer, books, inventor, moon
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heliocentric, revolution, theory, plantets, astronomer, controversy
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noseless, geocentric, supernovas, sun, telescope, astronomer
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house arrest, telescope, compass, heliocentric, venus, moon
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laws, elliptical, orbit, books, heliocentric, gravity, astronomer
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Hans Lippershey
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gravity, motion, book, calculus, reflection, light
