Constraints on the deep interior structure of the Moon

One of the primary science objectives of the Gravity Recovery and Interior Laboratory (GRAIL) mission is to determine the structure of the lunar interior. We use Bayesian probability theory and multiple geophysical constraints, including the k₂ Love number, to calculate the probability density function of interior structure parameters. The k₂ Love number describes the lunar response to tidal forcings and depends on the interior structure and rheology including the deeper zones where seismic information is the weakest. GRAIL observations will reduce the uncertainty in the k₂ Love number, thereby providing tighter constraints on the deep interior structure.