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  2. Nuclear thermal rocket - Wikipedia

    en.wikipedia.org/wiki/Nuclear_thermal_rocket

    In 1944, Stanisław Ulam and Frederic de Hoffmann contemplated the idea of controlling the power of nuclear explosions to launch space vehicles. [9] After World War II, the U.S. military started the development of intercontinental ballistic missiles (ICBM) based on the German V-2 rocket designs.