NASA to test nuclear thermal rocket engine for the first time in 50 years | CNN
NASA and Defense Advanced Research Projects Agency, a research arm of the US Defense Department, are once again setting their sights on a type of rocket engine that could be the holy grail for quickly and safely getting humans to Mars.
https://edition.cnn.com/2023/01/24/world/nasa-nuclear-thermal-rocket-engine-mars-scn/index.html