Lunar structure refers to the detailed study and analysis of the physical composition and characteristics of the Moon. This research area focuses on understanding the internal structure, surface features, geological formations, and overall composition of the Moon. Scientists use a variety of tools and techniques, such as remote sensing, seismic profiling, and sample analysis, to study the lunar structure and gain insights into the Moon's formation and evolution. This research area is important for furthering our understanding of the Moon's history, as well as for potential future exploration and utilization of lunar resources.