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character: Clyde Tombaugh
topic: Discovery of Pluto and its impact on planetary classification
grade: 12
subject: Foreign Language
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character: Astronomers
topic: Post-Tombaugh debates on what constitutes a planet
grade: 12
subject: Foreign Language
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character: International Astronomical Union (IAU)
topic: Definition of a planet and the reclassification of Pluto
grade: 12
subject: Foreign Language
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character: Astrobiologists
topic: Evolution of planetary classifications and implications for astrobiology
grade: 12
subject: Foreign Language
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