The Extraterrestrial Encyclopedia: An Alphabetical Reference to All Life in the Universe
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Cosmic Biology: How Life Could Evolve on Other Worlds
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The Cosmic Zoo: Complex Life on Many Worlds
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We Are Not Alone: Why We Have Already Found Extraterrestrial Life
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Voids of Eternity: Alien Encounter
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Megacatastrophes!: Nine Strange Ways the World Could End
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Alien Encounter Lib/E: A Scientific Novel
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Life in the Universe: Expectations and Constraints
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A One Way Mission to Mars
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Alien Encounter: A Scientific Novel
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