NASA called off the second attempt to launch an ambitious test flight of its new moon rocket because of a leak that delayed fueling.

Afghan Voice Agency (AVA)_Monitoring, The space agency hoped to launch its Artemis 1 moon mission atop a towering Space Launch System (SLS) megarocket on Saturday, but a hydrogen fuel leak detected about seven hours before liftoff thwarted the attempt.

“We have a scrub for the day, a cutoff, of the launch attempt for Artemis 1,” NASA commentator Derrol Nail said about three hours before the scheduled launch.

The delay, the second this week for NASA’s Artemis 1 moon mission, means the agency will have to wait until Monday at the earliest to make its next launch attempt. And that’s if the source of the leak can be fixed in time.

“We’ll go when it’s ready. We don’t go until then, and especially now on a test flight,” NASA Administrator Bill Nelson said in televised comments after the scrub. “This is part of the space business.”