Washington (AFP) – NASA’s fourth attempt to complete a critical test of its Moon rocket achieved around 90 percent of its goals, but there’s still no firm date for the behemoth’s first flight, officials said Tuesday. Known as the “wet dress rehearsal” because it involves loading liquid propellant, it is the final item to cross off the checklist before the Artemis-1 mission slated for this summer: an uncrewed lunar flight that will eventually be followed by Moon boots on the ground, likely no sooner than 2026. Teams at the Kennedy Space Center began their latest effort to complete the exercise …