character: Galileo Galilei
topic: Challenge to the Geocentric Model
grade: 6
subject: History
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character: Nicolaus Copernicus
topic: Heliocentric Theory
grade: 6
subject: History
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character: Johannes Kepler
topic: Planetary Motion
grade: 6
subject: History
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character: Aristotle
topic: Geocentric Universe
grade: 6
subject: History
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