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Ringworld - Larry Niven

1970 - Louis Wu is a reluctant member of the a rag-tag expedition to Ringworld, a gargantuan super-structure encircling a distant star. Wu's been recruited for a secret mission by Nessus, a two-headed alien whose species is threatened by cosmic Armageddon. After crashlanding on the Ringworld, Wu and his crew adventure across the ring in search of a way back to civilization. The story explores who built the Ringworld, its scientific explanation, and Nessus's secret motive for the mission.