character: Nicolaus Copernicus
topic: Heliocentric model of the universe
grade: 9
subject: History
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character: Galileo Galilei
topic: Support for the Heliocentric model
grade: 9
subject: History
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character: Tycho Brahe
topic: Astronomical observations and the transition to heliocentrism
grade: 9
subject: History
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character: Johannes Kepler
topic: Elliptical orbits and the advancement of heliocentric theory
grade: 9
subject: History
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