NASA, Artemis
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NASA, Boeing and Starliner
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NASA has been battling hydrogen fuel leaks ever since the space shuttle era, which provided many of the SLS engines. The first Artemis test flight without anyone on board was grounded for months by leaking hydrogen before finally blasting off in November 2022.
The lone previous Artemis mission, Artemis 1, successfully sent an uncrewed Orion to lunar orbit and back in late 2022. That flight was delayed multiple times by leaks of liquid hydrogen (LH2) propellant during ground testing, and it looked like Artemis 2 might be heading down a similar path.
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Artemis 2 SLS rocket begins launch countdown for fueling test at Kennedy Space Center
NASA's Artemis 2 Space Launch System rocket begins wet dress rehearsal fueling test at Kennedy Space Center, preparing for the mission to carry astronauts around the Moon.
NASA has started the countdown for a second wet dress rehearsal for its Artemis II moon mission, a critical practice run leading up to the planned launch that will send astronauts on a journey around the Moon — the first such crewed flight in more than 50 years.