NASA officially announced that March 6 is the target date for the historic Artemis II mission, marking a major milestone in the plan to launch four astronauts on a voyage around the Moon after resolving rocket-fueling issues in a second substantial rehearsal this week.

While preparations could still push the launch date back, the US space agency on Thursday capped a nearly 50-hour rehearsal of the Artemis II launch countdown fueling the rocket with some 730,000 gallons of propellant without the fugitive hydrogen emissions that hobbled last month’s initial rehearsal

“I felt like last night was a big step in us earning our right to fly. So, I felt really good, very proud of the team.” said NASA launch director Charlie Blackwell-Thompson.

Artemis program managers believe that the Wet Dress Rehearsal was a comprehensive simulation of the Space Launch System’s launch-day countdown, which went smoothly. While work continues, the timeline could still further into NASA’s March launch window. The space agency confirmed it successfully fueled the rocket and that the launch will proceed following a flight readiness review.

The launch will mark the first time in 54 years that humans will travel beyond the Earth’s orbit toward the Moon. The last such journey occurred during the Apollo 17 mission in 1972.