character: Johannes Kepler
topic: Laws of Planetary Motion
grade: 11
subject: Science
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character: Isaac Newton
topic: Gravitational Force and Orbits
grade: 11
subject: Science
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character: Galileo Galilei
topic: Observations of Celestial Bodies
grade: 11
subject: Science
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character: Tycho Brahe
topic: Predecessor of Kepler's Discoveries
grade: 11
subject: Science
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