character: Albert Einstein
topic: General Relativity and its implications for black holes
subject: Science
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character: Stephen Hawking
topic: Hawking Radiation and black hole thermodynamics
subject: Science
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character: Carl Sagan
topic: Cosmos and the universe's mysteries including black holes
subject: Science
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character: Roger Penrose
topic: Singularity Theorems and implications for black holes
subject: Science
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