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Project Orion (nuclear propulsion)
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Project Orion was a study conducted in the 1950s and 1960s by the United States Air Force, DARPA, and NASA into the viability of a nuclear pulse spaceship that would be directly propelled by a series of atomic explosions behind the craft. Following preliminary ideas in the 1940s and a classified paper co-authored by physicist Stanisław Ulam in 1955, DARPA agreed to sponsor and fund the program in July 1958.