These photos show how teams at NASA’s Marshall Space Flight Center in Huntsville, Alabama, are using the Flat Floor Facility (Building 4619) to understand the lunar lighting environment in preparation for the Artemis III crewed lunar landing mission, slated for 2027. The Flat Floor Facility is an air-bearing floor, providing full-scale simulation capabilities for lunar surface systems by simulating zero gravity in two dimensions. Wearing low-fidelity materials, test engineers can understand how the extreme lighting of the Moon’s South Pole could affect surface operations during Artemis III. High-intensity lights are positioned at a low angle to replicate the strong shadows that are cast across the lunar South Pole by the Sun. Data and analysis from testing at NASA Marshall are improving models Artemis astronauts will use in preparation for lander and surface operations on the Moon during Artemis III. Testing in the facility is also helping cross-agency teams evaluate various tools astronauts may use. NASA Marshall manages the Human Landing System (HLS) Program. For more information, contact NASA Marshall’s Office of Communications at 256-544-0034.