NASA has once again postponed the launch of Artemis II, the crewed lunar flyby mission, setting a new launch window for April. NASA reported that rapid preparations have allowed it to potentially preserve the April launch window in the event of a reversal. Artemis II: The SetbacksThe mission had its first launch window between February 6 and 11. Hydrogen gas concentrations remained under allowable limits, giving engineers confidence in new seals installed in an interface used to route fuel to the rocket,” NASA said. Although there will be no lunar landing—that feat will fall to the Artemis III mission—the second launch is of crucial importance.