The research area of lunar interior focuses on studying the composition, structure, and dynamics of the interior of the Moon. This involves analyzing seismic data from the Moon's surface to understand its internal structure, studying samples brought back from lunar missions to analyze the Moon's composition, and using computer models to simulate the Moon's formation and evolution. By studying the lunar interior, scientists aim to gain a better understanding of the Moon's formation and history, as well as its relationship to other planetary bodies in the solar system. This research area is important for advancing our knowledge of planetary geology and the processes that shape planetary bodies.