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The team's findings suggest the moon possesses a solid, iron-rich inner core with a radius of nearly 150 miles and a fluid, primarily liquid-iron outer core with a radius of roughly 205 miles. Where it differs from Earth is a partially molten boundary layer around the core estimated to have a radius of nearly 300 miles.
The research indicates the core contains a small percentage of light elements such as sulfur, echoing new seismology research on Earth that suggests the presence of light elements - such as sulfur and oxygen - in a layer around our own core.
Is it really that mysterious?
Originally posted by DJW001
Given that the core is rich in iron, the absence of a lunar magnetosphere remains a mystery.
The question lingers: what shut off the Moon's magnetic field? The best guess is that the core, like the rest of the Moon, cooled enough to cause the core to solidfy, at least partway. The magnetic field would have shut down when the flow of molten metal in the core ceased.