character: Johannes Kepler
topic: Kepler's Three Laws of Planetary Motion
grade: 10
subject: Physics
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character: Isaac Newton
topic: Gravitational Force and Its Relation to Kepler's Laws
grade: 10
subject: Physics
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character: Galileo Galilei
topic: Influence on the Development of Astronomy and Planetary Motion
grade: 10
subject: Physics
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character: Tycho Brahe
topic: Astronomical Observations That Led to Kepler's Laws
grade: 10
subject: Physics
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