character: Nicolaus Copernicus
topic: Shift from Ptolemy’s geocentric model to heliocentrism
grade: 6
subject: History
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character: Ptolemy
topic: Geocentric model of the universe
grade: 6
subject: History
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character: Galileo Galilei
topic: Support for heliocentrism
grade: 6
subject: History
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character: Johannes Kepler
topic: Laws of planetary motion supporting heliocentrism
grade: 6
subject: History
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