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Why Humanity Needs a Home Beyond Earth is a foundational white paper examining the long-term structural implications of humanity existing entirely within a single planetary habitat. Rather than addressing questions of technology, destinations, or timelines, the paper focuses on a more fundamental issue: whether a complex, long-lived civilization can maintain continuity indefinitely while remaining confined to one environment. The argument is developed through a cross-domain analysis drawing on biological principles of redundancy, historical patterns of habitat expansion, psychological requirements for credible future horizons, and ethical considerations related to stewardship and risk concentration. Across these domains, systems that concentrate all activity within a single environment exhibit inherent exposure to correlated failure, even when they remain stable for extended periods. The paper distinguishes clearly between exploration and habitation, emphasizing that civilizational continuity depends not on presence or reach, but on the existence of persistent living environments in which ordinary human life can unfold. In this framing, habitation beyond Earth is not treated as an emergency response, an act of escape, or a technological imperative, but as a potential long-horizon extension of historical patterns of human settlement. Importantly, this work does not propose specific locations, technologies, programs, or schedules. Its purpose is conceptual rather than prescriptive: to establish a clear structural foundation upon which future technical, architectural, policy, or ethical discussions may be grounded without urgency or advocacy. The paper is intended for researchers, policymakers, educators, and interdisciplinary readers interested in civilizational resilience, long-term planning, and the philosophical foundations of human expansion beyond Earth.