Exobiology
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Fermi's Paradox
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Panspermia
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SETI
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Search for ET!
Interactive Flash tutorial exploring the possibility of and search for life on other worlds.
The Rise and Fall of Star Faring Civilizations in Our Own Galaxy
Speculation, based on the Drake Equation, regarding the existence and composition of alien civilizations.
The Planetary Society
A nonprofit organization devoted to the exploration of the solar system and the search for extraterrestrial life.
Life Extraterrestrial: Life on Other Planets in the Solar System
Curriculum framework for comparing Earth to other planets with regard to life.
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