During a recent exchange with his collaborators, Elon Musk unveiled his projection: within the next two to three years, space could offer the most economical solution for deploying ...

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 ...

NASA’s Psyche spacecraft, located nearly 150 million miles from Earth on the way to an unexplored metal asteroid, has stopped firing its engines after detecting a problem in its propulsion system.