character: Carl Sagan
topic: The universe's mysteries and the significance of black holes
subject: Science
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character: Stephen Hawking
topic: Black holes and their impact on the fabric of the universe
subject: Science
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character: Neil deGrasse Tyson
topic: Exploring the cosmos and understanding black holes
subject: Science
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character: Lisa Randall
topic: The role of black holes in galactic evolution and cosmic mystery
subject: Science
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