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"Extraterrestrial origin" as a book category denotes works—fiction and nonfiction—centered on beings, objects, life, artifacts, signals, or phenomena that originate beyond Earth. It includes first-contact stories, alien civilizations and technologies, theories of panspermia or cosmic seeding, UFO investigations, and narratives in which an extraterrestrial provenance explains mysteries on Earth; tones range from hard science fiction and speculative exploration to horror, thriller, or philosophical meditations. Common themes are otherness, communication, ethical and societal impact, scientific discovery, and the consequences of realizing humanity is not alone.

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