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Internal structure and composition of the Moon provide important clue and constraints on theories for how the Moon formed and evolved.The Apollo seismic network has contributed to the internal structure modeling.Efforts have been made to detect the lunar core from the noisy Apollo data, but there is scant information about the structure below the deepest moonquakes at about 1000 km depth.On the other hand, there have been geodetic studies to infer the deep structure of the Moon.