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"Alien artifact" is a book category centered on objects of extraterrestrial origin whose discovery, study, or use drives the plot. These stories focus less on aliens as characters and more on mysterious devices, ruins, or technologies that reveal unknown physics, intelligence, or danger, prompting scientific detective work, ethical dilemmas, and geopolitical or personal conflict. Common elements include archaeological or salvage hunts, reverse-engineering, containment vs. exploitation by militaries or corporations, communication puzzles, and often escalating consequences that range from local catastrophe to civilization-scale change. Tone can vary from sense-of-wonder hard science fiction to techno-thrillers or cosmic horror, and the genre frequently explores themes of human curiosity, hubris, and the limits of understanding when faced with truly alien artifacts.

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