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卡尔·萨根
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Prediction
Title
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Unknown
El Cometa
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Murmurs of Earth : the Voyager Interstellar Record
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Conversations with Carl Sagan
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Cosmos a personal journey
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A path where no man thought
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LIFE Science Library: Planets
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Ufo's: A Scientific Debate
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Communication with Extraterrestrial Intelligence (C …
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Life-How Did it Get Here? By Evolution or By Creati …
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Life in the Universe Essays
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