character: Johannes Kepler
topic: Kepler's Laws of Planetary Motion
grade: 9
subject: Science
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character: Isaac Newton
topic: Gravitational Forces and Orbital Motion
grade: 9
subject: Science
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character: Galileo Galilei
topic: The Role of Telescopes in Astronomical Discoveries
grade: 9
subject: Science
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character: Carl Sagan
topic: Understanding the Universe and Its Dynamics
grade: 9
subject: Science
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