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“Asteroid impact” books center on the discovery, threat, event, and aftermath of a collision between an asteroid or comet and a planet—most often Earth. The category spans hard science fiction and techno-thrillers to apocalyptic and post-apocalyptic survival tales, along with nonfiction exploring near‑Earth objects, historical impacts (like the dinosaur‑ending Chicxulub event), risk assessment, and planetary defense strategies. Common motifs include the tense countdown to impact, deflection or mitigation missions, international cooperation and conflict, ethical tradeoffs, disaster logistics, and the environmental and social upheaval that follows. Protagonists may be scientists, astronauts, policymakers, first responders, or ordinary people, with tones ranging from rigorously plausible to speculative. The unifying focus is humanity’s vulnerability to—and resilience in the face of—cosmic catastrophe.

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