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 Wednesday, Oct. 8, 2025. The simulations go through launch day scenarios to help launch team members test software and make adjustments if needed during countdown operations. For Artemis II, four astronauts will venture around the Moon, the first crewed mission on NASA’s path to establishing a long-term presence for science and exploration through Artemis.