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Study Confirms Moon's Solid Inner Core, Reveals Volcanic Secrets

11/14/2025

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Summary

Story summary

The National Centre for Scientific Research (CNRS) in France confirms the Moon has a solid inner core with iron-like density.
Nature published the study, describing a solid inner core radius about 258 kilometers, surrounded by a molten outer layer roughly 360 kilometers thick.
The finding supports the mantle overturn theory and explains the Moon's volcanic regions.
The ancient magnetic field faded around 3.2 billion years ago.

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Story summary

The National Centre for Scientific Research (CNRS) in France confirms the Moon has a solid inner core with iron-like density.
Nature published the study, describing a solid inner core radius about 258 kilometers, surrounded by a molten outer layer roughly 360 kilometers thick.
The finding supports the mantle overturn theory and explains the Moon's volcanic regions.
The ancient magnetic field faded around 3.2 billion years ago.