character: Johannes Kepler
topic: Planetary motion and orbits
grade: 1
subject: Writing
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character: Galileo Galilei
topic: Support of heliocentric theory
grade: 1
subject: Writing
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character: Isaac Newton
topic: Laws of motion and universal gravitation
grade: 1
subject: Writing
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character: Copernicus
topic: Heliocentric model of the universe
grade: 1
subject: Writing
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