The initial date for the third attempted launch of the Artemis mission team was Sept. 23, but the date has now been moved back four days. Oct. 2 is the other possible backup date that is "under review," NASA reported.

The space agency is currently working on a problem with the rocket called the "Space Launch System" or SLS, which sprung a leak that occurred while filling the super-cold liquid hydrogen tank during the launch attempt at Kennedy Space Center in Florida on Sept. 3. 

The Sept. 27 launch window is 70 minutes, shorter than the 120-minute window available for Sept. 23.

On its Artemis blog, NASA said it has "been working to test the system that feeds the liquid hydrogen on Sept. 17, but the date for that cryogenic test has been pushed back to Sept. 21." 

"The updated dates represent careful consideration of multiple logistical issues, including the additional value of having more time to prepare for the cryogenic demonstration test, and subsequently more time to prepare for launch. The dates also allow managers to ensure that teams have sufficient rest and replenish cryogenic propellant supplies," NASA shared in the blog post.

The upcoming Sept. 21 test will also include an engine purge test, the agency explained, to avoid complications. 

The mission team scrubbed Artemis I's first launch attempt on Aug. 29 because officials believed there was an engine blowout due to a faulty sensor.