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smart, geocentric, earth centered, theory, planetary, astronomy.
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sun centred, astronomy, book, theory, mathematics, artist.
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observations, noiseless, astronomy, methodologies, apparatuses, solar system.
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thermometer, telescope, astronomy, sun centered, jail, falling-rate.
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solar system, intelligent, independent, planetary, motion, elliptical.
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Hans Lippershay invented the first telescope. The telescope was originally used only for the military but then later was used for astonomy.
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laws, science, motion, friction, light-waves, prism
