character: Nicolas Copernicus
topic: Historical context of cosmology before Einstein
grade: 12
subject: Physics
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character: Galileo Galilei
topic: Contributions to heliocentrism
grade: 12
subject: Physics
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character: Johannes Kepler
topic: Elliptical orbits and firmament
grade: 12
subject: Physics
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character: Isaac Newton
topic: Laws of motion and gravitation
grade: 12
subject: Physics
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