NASA is rocketing toward the launch of Artemis 2, targeting this weekend for a critical fueling test that stands as one of the last hurdles to clear before liftoff. This could thwart the agency’s wet dress plans. What is a wet dress rehearsal? Before the mission can launch, NASA must conduct a wet dress rehearsal to practice fueling and countdown procedures and verify that all integrated rocket and ground systems are functioning properly. If the temperature does drop below this threshold on Saturday, NASA will likely postpone the wet dress rehearsal.