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Planetary Defense books focus on how civilizations detect, prepare for, and mitigate cosmic threats to Earth or other inhabited worlds—most commonly asteroids and comets, but also space debris, extreme space weather, and occasionally hostile extraterrestrial forces. Spanning nonfiction and fiction, the category includes works on near‑Earth object surveys, impact modeling, deflection and disruption strategies, mission design, emergency management, and international law and policy, alongside hard‑science and techno‑thriller narratives that dramatize these efforts. Core themes include global cooperation, ethics under existential risk, rapid scientific innovation, and the intersection of astronomy, engineering, public safety, and geopolitics. Whether grounded in real research or speculative scenarios, Planetary Defense highlights the tools, strategies, and human stakes of safeguarding a world.

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