character: Carl Sagan
topic: Communication with Extraterrestrial Life
grade: 11
subject: Physics
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character: SETI (Search for Extraterrestrial Intelligence)
topic: Radio Signals and Communication Techniques
grade: 11
subject: Physics
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character: Drake Equation
topic: Estimating the Number of Communicative Civilizations
grade: 11
subject: Physics
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character: Fermi Paradox
topic: Why Haven't We Found Extraterrestrial Life?
grade: 11
subject: Physics
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