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Members of the Artemis launch team participate in an Artemis II launch countdown simulation inside Firing Room 1 in the Launch Control Center at NASA’s Kennedy Space Center in Florida on Thursday, May 8, 2025. The simulations go through launch day scenarios to help launch team members test software and make adjustments if needed during countdown operations. Artemis II is the first crewed flight under NASA’s Artemis campaign and is another step toward missions on the lunar surface and helping the agency prepare for future human missions to Mars.