: a process in which the nucleus of a heavy atom is split apart
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Antares is currently in the final phase of the Department of Energy’s Reactor Pilot Program, with a goal to achieve criticality—a stable, self-sustaining nuclear fission reaction—before July 4, 2026.—Aman Tripathi, Interesting Engineering, 23 Apr. 2026 First, it is generated at a power plant using coal, natural gas, nuclear fission, or renewables.—Big Think, 22 Apr. 2026 There's also the issue that nuclear fission is a highly toxic process.—Keith Cooper, Space.com, 27 Mar. 2026 Most fusion technologies, as well as nuclear fission, are based on generating heat to power steam turbines, which produce the electricity.—Jordan Blum, Fortune, 13 Feb. 2026 See All Example Sentences for nuclear fission