character: Johannes Kepler
topic: Kepler's Laws of Planetary Motion
grade: 11
subject: Physics
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character: Isaac Newton
topic: Gravitation and its Effects on Planetary Motion
grade: 11
subject: Physics
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character: Galileo Galilei
topic: Observations Leading to Kepler's Theories
grade: 11
subject: Physics
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character: Nicolaus Copernicus
topic: Heliocentric Model and Its Influence on Kepler
grade: 11
subject: Physics
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