Apart from fission induced by an exogenous neutron, harnessed and exploited by humans, a natural form of spontaneous radioactive decay (not requiring an exogenous neutron, because the nucleus already has an overabundance of neutrons) is also referred to as fission, and occurs especially in very high-mass-number isotopes. Spontaneous fission was discovered in 1940 by Flyorov, Petrzhak, and Kurchatov[3] in Moscow. In contrast to nuclear fusion, which drives the formation of stars and their development, one can consider nuclear fission as negligible for the evolution of the universe. Nonetheless, natural nuclear fission reactors may form under very rare conditions. Accordingly, all elements (with a few exceptions, see “spontaneous fission”) which are important for the formation of solar systems, planets and also for all forms of life are not fission products, but rather the results of fusion processes.
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Apart from fission induced by an exogenous neutron, harnessed and exploited by humans, a natural form of spontaneous radioactive decay (not requiring an exogenous neutron, because the nucleus already has an overabundance of neutrons) is also referred to as fission, and occurs especially in very high-mass-number isotopes. Spontaneous fission was discovered in 1940 by Flyorov, Petrzhak, and Kurchatov[3] in Moscow. In contrast to nuclear fusion, which drives the formation of stars and their development, one can consider nuclear fission as negligible for the evolution of the universe. Nonetheless, natural nuclear fission reactors may form under very rare conditions. Accordingly, all elements (with a few exceptions, see “spontaneous fission”) which are important for the formation of solar systems, planets and also for all forms of life are not fission products, but rather the results of fusion processes.