To detect seismic waves, silly
Yet many critical questions such as the state and composition of the Moon's interior remain unsolved, owing to the fact that few Apollo seismic monitors were deployed as well as the strong scattering of seismic waves in the top layer, or regolith, of the Moon. Hence, while the Apollo data provides some hints about the Moon's core, details on its size and properties are still hazy.
This works best over distances of 100km or more, meaning that the proposal would require the deployment of a considerable amount of optical fiber across the surface of the Moon – which is a challenging environment at the best of times.
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