The launch countdown for the Space Launch System (SLS) rocket and the Artemis I mission is underway at the Kennedy Space Center in Florida ahead of a planned liftoff within a two-hour launch window that opens at 8:33 AM EDT (12:33 UTC) on Monday, August 29.
The launch count comes after more than a decade of development, capped by successful Green Run and Wet Dress Rehearsal tests — both of which provided good lessons learned and changes in procedures for launch day.