character: Carl Sagan
topic: Astrobiology and the Search for Extraterrestrial Life
grade: 11
subject: Physics
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character: Neil deGrasse Tyson
topic: Astrobiology and space exploration
grade: 11
subject: Physics
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character: Stephen Hawking
topic: The possibilities of extraterrestrial life
grade: 11
subject: Physics
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character: Bill Nye
topic: Science and the search for alien life
grade: 11
subject: Physics
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