character: Carl Sagan
topic: Gravitational Effects on Astronomy
grade: 10
subject: Physics
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character: Albert Einstein
topic: General Relativity
grade: 10
subject: Physics
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character: Isaac Newton
topic: Law of Universal Gravitation
grade: 10
subject: Physics
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character: Galileo Galilei
topic: Observational Astronomy
grade: 10
subject: Physics
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