Demonstration Rocket for Agile Cislunar Operations

This illustration made available by NASA shows the Space Launch System during liftoff. On Wednesday, March 13, 2019, NASA's top official said the space agency's new rocket won't be ready for a moon shot next year. (Marshall Space Flight Center/NASA via AP)

And old idea gets a fresh look: A nuclear-powered space ship

The idea of a nuclear-powered spacecraft goes back decades. Now it may become reality. The Defense Advanced Research Projects Agency (DARPA) and NASA are…

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