It could take months to years for astronauts to journey to Mars and back, but what if there was a way to make the trip shorter? NASA and Defense Advanced Research Projects Agency are figuring out how to use nuclear engines for future Mars missions. via Space
This relatively long transit time is a result of the use of traditional chemical rocket fuel. An alternative technology to the chemically propelled rockets the agency develops now is called nuclear thermal propulsion, which uses nuclear fission and could one day power a rocket that makes the trip in just half the time.
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