character: Nicolaus Copernicus
topic: The heliocentric model of the solar system
grade: 1
subject: Writing
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character: Galileo Galilei
topic: Supporting the heliocentric theory
grade: 1
subject: Writing
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character: Johannes Kepler
topic: Planetary motion and orbits
grade: 1
subject: Writing
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character: Isaac Newton
topic: Gravity and its role in the solar system
grade: 1
subject: Writing
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