character: Carl Sagan
topic: Scientific contributions to SETI
grade: 11
subject: Physics
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character: SETI
topic: Importance of interdisciplinary approaches in astrophysics
grade: 11
subject: Physics
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character: NASA
topic: Involvement in projects inspired by Sagan's research
grade: 11
subject: Physics
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character: Drake Equation
topic: Foundation laid by Sagan for estimating extraterrestrial civilizations
grade: 11
subject: Physics
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