HE WAS the child genius who claimed to be the reincarnation of a Martian, shocking the world with tales of spaceships, ...

Human crews headed for Mars are still looking at journeys that last most of a year, long enough for radiation, boredom and mechanical risk to pile up. Nuclear propulsion promises to compress that ...

NASA is backing a new generation of nuclear rockets that could compress the months-long journey to Mars into a sprint measured in weeks. The most ambitious concepts on the table promise crewed trips ...