Technicians with Exploration Ground Systems, based at NASA’s Kennedy Space Center in Florida, perform propellant grain inspections on two of the agency’s Space Launch System solid rocket booster segments for the Artemis II campaign on Wednesday, Dec. 20, 2023, inside the Rotation, Processing and Surge Facility. The team is inspecting the propellant of all 10 booster segments before they are rotated vertically for processing. The Artemis II mission will send four astronauts around the Moon as part of the agency’s effort to establish a long-term science and exploration presence at the Moon, and eventually Mars.