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» Life Extraterrestrial: Life on Other Planets in the Solar System - Curriculum framework for comparing Earth to other planets with regard to life.

» The Planetary Society - A nonprofit organization devoted to the exploration of the solar system and the search for extraterrestrial life.

» 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.

» Search for ET! - Interactive Flash tutorial exploring the possibility of and search for life on other worlds.

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