PRIME-1 MSolo MLI Install. Engineers install multilayer insulation (MLI) on the Mass Spectrometer Observing Lunar Operations (MSolo) instrument inside Kennedy Space Centers Space Station Processing Facility on Oct. 20, 2022. The activity is in preparation for the Polar Resources Ice Mining Experiment-1 (PRIME-1) mission, which will be the first in-situ resource utilization demonstration on the Moon. MLI protects the instrument from thermal temperature extremes, helping to insulate at cold temperatures and to cool at higher temperatures when solar lighting conditions or lunar infrared reflects onto the instrument. Researchers and engineers are preparing MSolo instruments to launch on four robotic missions as part of NASAs Commercial Lunar Payload Services - commercial deliveries beginning in 2023 that will perform science experiments, test technologies, and demonstrate capabilities to help NASA explore the Moon and prepare for crewed missions to the lunar surface.