character: Johannes Kepler
topic: Laws of Planetary Motion
grade: 12
subject: History
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character: Nicolaus Copernicus
topic: Heliocentrism
grade: 12
subject: History
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character: Galileo Galilei
topic: Support of Heliocentrism
grade: 12
subject: History
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character: Isaac Newton
topic: Universal Gravitation and its implications on Celestial Mechanics
grade: 12
subject: History
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