A sufficiently massive star can produce gamma rays of such high energy that some of the photons convert into pairs of electrons and positrons causing a runaway reaction which destroys the star.
22.
Concentrated solutions of hydrogen peroxide _ more than 30 percent, mixed with water _ have acquired a risky reputation because they can start runaway reactions if exposed to impurities in the wrong kind of container.
23.
The carbon-burning core compresses and heats up as the electron-positron pairs remove pressure from outwards photons, until the oxygen stored in the core suddenly ignites in a thermal runaway reaction which exerts a pulse outwards, then stabilises.
24.
If the mixture becomes too hot, it results in a runaway reaction, a state of accelerated nitration accompanied by the destructive oxidation of organic materials by the hot nitric acid and the release of poisonous nitrogen dioxide gas at high risk of an explosion.
25.
In the letter to Scientific American, the writer displays a technical virtuosity in discussing an article on whether advanced nuclear reactors could initiate runaway reactions, and cites the issue as " a good example of the arrogance of scientists, who routinely take risks affecting the public ."
26.
If a white dwarf forms a close binary system with another star, hydrogen from the larger companion may accrete around and onto a white dwarf until it gets hot enough to fuse in a runaway reaction at its surface, although the white dwarf remains below the Chandrasekhar limit.
27.
The key element in the plan is to create a reactor that would, unlike any other kind of nuclear reactor ever built or proposed, contain a " subcritical " mass of nuclear fuel-- one that is inherently incapable of producing a runaway reaction such as those that devastated Three Mile Island and Chenobyl.
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