character: Carl Sagan
topic: Pale Blue Dot
grade: 12
subject: Physics
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character: Neil deGrasse Tyson
topic: Cosmos and the Universe
grade: 12
subject: Physics
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character: Albert Einstein
topic: General Relativity and the Nature of Space
grade: 12
subject: Physics
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character: Stephen Hawking
topic: Black Holes and Cosmology
grade: 12
subject: Physics
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