NASA's star-crossed Space Launch System moon rocket was grounded for the second time in five days Saturday, this time by a large hydrogen leak in a fuel line quick-disconnect fitting that will ...

The bold question-askers at What If present a radical new plan for space travel using hydrogen balloons instead of rockets.

A hydrogen leak prevented the launch of NASA’s SLS rocket this Saturday, in what is a troubling yet highly predictable development.

Injecting aerosols into the atmosphere – but at higher altitudes than planes can reach – could cool the climate while ...

Europe's new Ariane 6 rocket ditched the helium of its predecessor Ariane 5 for a novel pressurization system that converts a small portion of its primary liquid oxygen and hydrogen propellants to ...

NASA scrubbed its second attempt to launch its Artemis 1 test flight on a mission to send an unpiloted capsule on a 37-day trip around the moon and back.

NASA encountered some trouble early in the day as the space agency conducted a tanking test to determine if a fuel leak on the Artemis-1 rocket is fixed.

The showstopper was an 8-inch diameter line carrying liquid hydrogen into the rocket. It sprang a persistent leak at the inlet, known as a quick-disconnect, leading onboard the vehicle.

Europe's new Ariane 6 rocket ditched the helium of its predecessor Ariane 5 for a novel pressurization system that converts a small portion of its primary liquid oxygen and hydrogen propellants to ...