character: Nicolaus Copernicus
topic: Heliocentric Theory
grade: 10
subject: Physics
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character: Johannes Kepler
topic: Laws of Planetary Motion
grade: 10
subject: Physics
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character: Galileo Galilei
topic: Observations of Celestial Bodies
grade: 10
subject: Physics
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character: Isaac Newton
topic: Law of Universal Gravitation
grade: 10
subject: Physics
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