character: Johannes Kepler
topic: Planetary Motion and the Heliocentric Model
grade: 6
subject: History
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character: Nicolaus Copernicus
topic: Heliocentric Theory
grade: 6
subject: History
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character: Galileo Galilei
topic: Support for Heliocentrism
grade: 6
subject: History
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character: Isaac Newton
topic: Laws of Motion and Gravity
grade: 6
subject: History
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