character: John Archibald Wheeler
topic: The Concept of Black Holes
subject: Science
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character: Albert Einstein
topic: General Relativity and its Connection to Black Holes
subject: Science
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character: Stephen Hawking
topic: Hawking Radiation and Black Holes
subject: Science
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character: Roger Penrose
topic: Penrose Process and Energy Extraction from Black Holes
subject: Science
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