character: Johannes Kepler
topic: Calculating planetary orbits
grade: 8
subject: English Language
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character: Galileo Galilei
topic: Support for heliocentric model
grade: 8
subject: English Language
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character: Isaac Newton
topic: Laws of motion and universal gravitation
grade: 8
subject: English Language
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character: Nicolas Copernicus
topic: Sun-centered universe theory
grade: 8
subject: English Language
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