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stars, revolving, earth, universe, planterary, geocenteric
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revolution, astronomy, geocentric, helocentrc, sun,mathematician
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comets, astronomy, mythologists, measurin, supernova, orbit
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telescope, thermoemeter, astronomy, space, sun, stars
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planterary, motion, astronomy, mathmatician, orbiting, sun
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Galieo invented the telescope in 1608.
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gravity, motion, light, expierments, reflecting, telescope
