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Generation ships is a science-fiction category centered on starships traveling so slowly that entire human lifetimes—and multiple generations—pass before reaching a destination. Stories explore the ship as a closed ecosystem and self-contained society, where descendants of the original crew inherit a mission they didn’t choose. Typical themes include resource scarcity, governance and social control, cultural drift or mythmaking about the ship’s purpose, ethical questions around reproduction and population limits, and the tension between maintaining the mission and individual freedom. Plots often turn on revelations about the ship’s true nature, mutinies, class divides, or the challenges of finally arriving—if arrival happens at all. The focus blends hard-science problems of life support and propulsion with rich social and psychological speculation.

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