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geocentric, astronomer, treatises, constellations, greek, craters
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heliocentric, astronomer, orbits, initiator, universe, model
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tychonic, revolve, supernovas, no nose, moon, mars
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3 laws, circular, orbit, books, revolving, eliptical
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Invented by Hans Leppershey. It was used for seeing deep into space.
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astronomer, phisycist, compass, sun spots, acceleration, telescopes
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physics, motion, gravity, books, planets, reflecting
