CAPE CANAVERAL, Florida NASA's Artemis 1 moon mission has returned to the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center (KSC) here following incomplete "wet dress rehearsal" attempts earlier this month.

During the wet dress, which took place at KSC's Pad 39B, NASA was unable to run its new rocket, the Space Launch System (SLS), through the complete gambit of tests needed to ensure that the vehicle is ready for flight. The agency has now brought the huge rocket back to the VAB to make some minor repairs and adjustments.

The Artemis 1 stack rolled off Pad 39B at 7:54 p.m. EDT (2354 GMT) on Monday (April 25) atop NASA's huge crawler-transporter 2 vehicle. The SLS and Orion arrived at the VAB, which is 4 miles (6.4 kilometers) away, at about 6 a.m. EDT (1000 GMT) on Tuesday (April 26), NASA officials said in an update.

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Artemis 1 will use the first-ever SLS to send an uncrewed Orion capsule around the moon and back sometime later this year. If all goes well with Artemis 1, Artemis 2 will launch astronauts around the moon in 2024, and Artemis 3 will put boots on the lunar surface in 2025 or 2026.

It's unclear when Artemis 1 will get off the ground; NASA officials won't set an official target date until the wet dress is done and they've had a chance to analyze the data.

SLS began its journey from the VAB to Pad 39B on March 17 and got there about 12 hours later, early in the morning of March 18. NASA began the wet dress rehearsal on April 1 and had hoped to complete a simulated countdown by April 3.

Unfortunately, propellant loading operations during the wet dress rehearsal revealed several technical issues with the SLS and its mobile launch tower. The Artemis 1 team identified a faulty valve in the launch tower, as well as a hydrogen leak in a line leading from the tower to the rocket.

The decision was made to fix these problems before another attempted wet dress rehearsal. At the VAB, technicians will examine the Artemis 1 stack and make repairs to gear up for another run at the wet dress rehearsal in the coming weeks.

With all the work ahead, Artemis 1 will likely not be ready in time for the missions mid-summer launch window of June 29 to July 12, and is now targeting a date sometime in August, sources at NASA told Space.com.

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NASA's Artemis 1 moon rocket rolls off the launch pad for repairs (photos) - Space.com