|There is more information available on this subject at Nuclear fission on the English Wikipedia.|
Nuclear fission is a process where a large atomic nucleus (such as uranium) is split into smaller particles. A nuclear fission reaction releases millions of times the amount of energy as is released in a typical chemical reaction, making it an efficient source of energy.
For centuries, humanity has used nuclear fission for energy production through nuclear power, as well as nuclear weapons. Both uses are possible because certain substances, called nuclear fuels, undergo fission when struck by fission neutrons, and in turn emit neutrons when they break apart. This enables a self-sustaining chain reaction that releases energy at a controlled rate in a nuclear reactor or at a very rapid uncontrolled rate in a nuclear weapon.
- Halo: Evolutions - Essential Tales of the Halo Universe, "The Impossible Life and the Possible Death of Preston J. Cole", page 445 (2009 paperback); page 289 (2010 Volume 1 paperback)