NASA has announced a significant delay for its Artemis II lunar mission as the rocket has been rolled back to the hangar for urgent repairs following multiple technical malfunctions, including a helium flow problem. Originally targeting a March launch, the mission now faces uncertainty with new estimates pushing the potential launch to April. Four astronauts, initially in quarantine for the mission, have been released as NASA resolves these issues. The Artemis II mission, which aims to send humans back around the Moon, has suffered from various setbacks, raising concerns about the timeline for future lunar exploration efforts.