NASA on May 16th announced the new possible launch dates for first SLS launch, outlining potential launch windows through the first half of 2023, with the first at the end of July 2022.
The calendar of launch windows through June of ’23 can be viewed here [pdf].
The July 26th to August 10th window is the one the agency is clearly targeting for that first launch, but it will not confirm this until after SLS successfully completes the next dress rehearsal countdown attempt in June. That the agency is now showing us potential launch dates in ’23 also suggests it is anticipating the possibility the launch could be delayed that much, especially if it determines it must replace the SLS’s two solid rocket boosters because they have been stacked unused for too long.
SLS was initially planned for a launch in 2015. It is now seven-plus years behind schedule, which is how long it took SpaceX to go from a blank sheet of paper to launching its Falcon Heavy for the first time.
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