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It was developed and ready to be flown, but the project was canceled. https://en.wikipedia.org/wiki/NERVA#NERVA_XE https://en.wikipedia.org/wiki/NERVA#NERVA_XE

by raylad 5y ago

It was developed and ready to be flown, but the project was canceled. https://en.wikipedia.org/wiki/NERVA#NERVA_XE https://en.wikipedia.org/wiki/NERVA#NERVA_XE Recently, work has started up again, and two companies have active contracts to begin developing nuclear engines: https://en.wikipedia.org/wiki/Nuclear_thermal_rocket#Current_research_in_US_since_2000 https://en.wikipedia.org/wiki/Nuclear_thermal_rocket#Current...