NASA is backing a new generation of nuclear rockets that could compress the months-long journey to Mars into a sprint ...

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 ...

Every year, companies and space agencies launch hundreds of rockets into space—and that number is set to grow dramatically with ambitious missions to the moon, Mars and beyond. But these dreams hinge ...