High Quality Content by WIKIPEDIA articles! A doomsday device is a hypothetical construction — usually a weapon — which could destroy all life on a planet, particularly the Earth, or destroy the planet itself (bringing "doomsday", a term used for the end of planet Earth). Most hypothetical contructions rely on the fact that hydrogen bombs can be made arbitrarily large assuming there are no concerns about delivering them to a target (see Teller–Ulam design) or that they can be "salted" with materials designed to create long-lasting and hazardous fallout (e.g.; a cobalt bomb). Doomsday devices have been present in literature and art especially in the 20th century, when advances in science and technology made world destruction (or at least the eradication of all human life) a credible scenario. Many classics in the genre of science fiction take up the theme in this respect.

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