character: Isaac Newton
topic: Gravitational Law and its relation to Kepler's Laws
grade: 8
subject: English Language
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character: Johannes Kepler
topic: Kepler's Laws of Planetary Motion
grade: 8
subject: English Language
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character: Sir Isaac Newton
topic: Universal Gravitation
grade: 8
subject: English Language
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character: Galileo Galilei
topic: Early Contributions to the Understanding of Motion
grade: 8
subject: English Language
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