character: Carl Sagan
topic: Astrobiology and the Search for Extraterrestrial Life
grade: 11
subject: Physics
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character: Frank Drake
topic: The Drake Equation and Estimating Alien Civilizations
grade: 11
subject: Physics
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character: Carl Sagan
topic: Cosmos: A Personal Journey and Public Understanding of Science
grade: 11
subject: Physics
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character: Carl Sagan
topic: SETI (Search for Extraterrestrial Intelligence) and Its Implications
grade: 11
subject: Physics
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