New Study Confirms Solid Core of Moon, Raises Questions on Disappearance of Magnetic Field

Utilizing Monte Carlo algorithmic modelling technique, drawing from Apollo seismic and GRAIL gravity field data, researchers at CNRS, Paris Observatory and other French institutions conclude Moon contains solid inner core ~516 km diameter with ~7,822 kg / m³, likely composed of Fe, representing ~15% relative to total size (by comparison, Earth’s inner core is ~20%); Findings concur with 2011 NASA study, and suggest mantle overturn activity as mechanism; Authors stress ramifications for ‘evolution of the Moon magnetic field’; Farside Seismic Suite to further investigate structure of Moon on Draper CLPS CP-12 mission lander NET 2025

Credits: Briaud, A., Ganino, C., Fienga, A. et al. The lunar solid inner core and the mantle overturn. Nature (2023). https://doi.org/10.1038/s41586-023-05935-7; NASA