A doomsday device is a hypothetical construction – usually a weapon or weapons system – which could destroy all life on a planet, particularly Earth, or destroy the planet itself, bringing "Human extinction", a term used for the end of planet Earth. Most hypothetical constructions rely on hydrogen bombs being made arbitrarily large, assuming there are no concerns about delivering them to a target (see Teller–Ulam design) or that they can be "salted bomb" with materials designed to create long-lasting and hazardous fallout (e.g., a cobalt bomb).
Doomsday devices and the nuclear holocaust they bring about 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. The term "doomsday machine" itself is attested from 1960, but the alliteration "doomsday device" has since become the more popular phrase.
The US and its doomsday device's theoretical ability to deter a nuclear attack is that it would go off automatically without human aid and despite human intervention. Kahn conceded that some planners might see "doomsday machines" as providing a highly credible threat that would dissuade attackers and avoid the dangerous game of brinkmanship caused by the massive retaliation concept which governed US-Soviet nuclear relations in the mid-1950s. However, in his discussion of doomsday machines, Kahn raises the problem of a nuclear-armed Nth country triggering a doomsday machine, and states that he didn't advocate that the US acquire a doomsday machine.
The Dead Hand (or "Perimeter") system built by the Soviet Union during the Cold War has been called a "doomsday machine" due to its fail-deadly design and nuclear capabilities.
Some works have also considered the erroneous activation of doomsday devices by external factors or . An example of both is Virus (1980), where an earthquake is misdetected as a nuclear explosion and triggers a sequence of Automated Reaction Systems (ARS). Various types of fictional doomsday devices have also been activated as part of an AI takeover.
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