character: Johannes Kepler
topic: Laws of Planetary Motion
grade: 8
subject: History
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character: Isaac Newton
topic: Newton's Laws of Motion
grade: 8
subject: History
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character: Galileo Galilei
topic: Early Astronomy Contributions
grade: 8
subject: History
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character: Copernicus
topic: Heliocentric Model
grade: 8
subject: History
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