After the “wet” dress rehearsal for Artemis II on February 19, 2026, an issue was found with the flow of helium in the upper stage. (In a wet dress rehearsal, the rocket is fueled and various scenarios for launch are simulated to prepare for the actual event.) The rocket was rolled back to the Kennedy Space Center’s Vehicle Assembly Building to fix the problem. However, rolling back the rocket meant that Artemis II did not launch until April 1, 2026.
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