character: Hubble
topic: Hubble's Law and the expansion of the universe
grade: 9
subject: Science
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character: Einstein
topic: General Relativity and its implications for the universe's expansion
grade: 9
subject: Science
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character: Edwin Hubble
topic: The discovery of the redshift in galaxies
grade: 9
subject: Science
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character: Stephen Hawking
topic: Black holes and their role in the universe's evolution
grade: 9
subject: Science
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