character: Johannes Kepler
topic: Planetary Motion
grade: 1
subject: Library
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character: Galileo Galilei
topic: Telescope Discoveries
grade: 1
subject: Library
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character: Isaac Newton
topic: Gravity and Orbits
grade: 1
subject: Library
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character: Nicolaus Copernicus
topic: Heliocentric Theory
grade: 1
subject: Library
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