It's difficult to imagine a substance that is hundreds of degrees below freezing yet still a liquid. Such is the strange ...

Liquid hydrogen fuel leaks forced NASA to delay the launch of Artemis II—the same scenario it encountered four years ago ...

It's not yet known whether the hydrogen leak encountered Monday will impact the moonshot's eventual launch date.

NASA stopped short of completing a critical fuel test for its Artemis 2 SLS rocket because of hydrogen leaks that sound a lot like the problems they had during Artemis 1.

NASA says it can't try until March at the earliest to send a crewed spacecraft on a flight around the moon and back, due to ...

Technical problems discovered during a pre-flight test have prompted NASA to postpone this important space mission.

NASA announced the news Tuesday, shortly after the critical fueling test ended at Kennedy Space Center. Until the ...

NASA plans to test the planned leak repair with a second dress rehearsal fueling test later this month.

NASA has delayed the Artemis II launch until March at the earliest after engineers discovered hydrogen leaks during last ...

NASA has postponed its long-awaited crewed moon mission until at least March after dangerous hydrogen fuel leaks halted the final dress rehearsal of its Space Launch System rocket.

Initially, it was hoped that the Artemis II mission to send astronauts slingshotting around the Moon could take place as early as Feb. 8. If all had gone well in this latest wet dress rehearsal, that ...

Just a couple of hours into the process, sensors detected too much hydrogen near the bottom of the rocket. Fueling was paused, with only half of the core stage filled.