character: Vesto Melvin Slipher
topic: Redshift and its role in galaxy discovery
grade: 9
subject: Science
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character: Edwin Hubble
topic: Expansion of the universe and Hubble's Law
grade: 9
subject: Science
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character: Albert Einstein
topic: Theory of relativity and implications for cosmology
grade: 9
subject: Science
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character: Carl Sagan
topic: The importance of astronomy in understanding the universe
grade: 9
subject: Science
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