character: Isaac Newton
topic: Newton's Laws of Motion and their Impact on Planetary Motion
grade: 9
subject: Physics
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character: Galileo Galilei
topic: Early Contributions to Motion and Gravity
grade: 9
subject: Physics
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character: Johannes Kepler
topic: Laws of Planetary Motion and Their Relationship to Newton's Laws
grade: 9
subject: Physics
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character: Albert Einstein
topic: Enhancements to Newtonian Physics and Gravitational Theory
grade: 9
subject: Physics
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