What lighter element is likely alloyed with iron in Mercury's core, helping it remain partially molten?
Answer
Sulfur
The iron heart of Mercury, despite being incredibly massive, is not composed purely of iron. Scientific investigation suggests that the core is likely alloyed with lighter elements. Specifically, sulfur is cited as one such element incorporated into the iron mixture. The presence of these lighter elements serves a critical function in the core’s physical state; they help explain why this dense metallic structure remains partially molten, a state necessary for supporting the planet's global magnetic field through internal convection and churning.
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