character: Galileo Galilei
topic: Observations of Planetary Bodies
grade: 12
subject: Physics
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character: Johannes Kepler
topic: Laws of Planetary Motion
grade: 12
subject: Physics
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character: Isaac Newton
topic: Universal Law of Gravitation
grade: 12
subject: Physics
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character: Tycho Brahe
topic: Astronomical Observations
grade: 12
subject: Physics
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