If all had gone according to plan, four astronauts might have been returning just this week from a history-making, 10-day slingshot trip around the moon. Instead, NASA’s engineers have been grappling ...

A former SpaceX engineer says he has solved the long-standing engineering problems that have kept water-based rocket propulsion from scaling beyond small satellites. The claim arrives against a ...

A Michigan defense contractor has developed a mobile refueling system that generates hydrogen fuel from solar power and atmospheric moisture, enabling military drones to operate continuously for up to ...