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is starkly drab and gray on the surface. But new research suggests that underneath, the tiny world harbors a glittering interior fit to be the jewel in the crown of our Solar System., researchers believe that Mercury has a layer of diamond up to 11 miles thick deep in the planet's rocky innards. It's a spectacular theory — one that not only dazzles the mind, but could help explain many of Mercury's puzzling attributes.
How the graphite got there raises questions. Scientists believe it must've once been molten, welling up from a magma ocean somewhere deep within Mercury's mantle — a vast layer that lies between crust and core — before eventually cooling. At the core-mantle boundary — where the lowermost part of the mantle abruptly transitions into the core — the researchers found that the pressures are actually closer to 5.575 gigapascals. With the introduction of sulfur dilution, they also found that the mantle material fully melted at a lower temperature than expected, at roughly 2,200 Kelvin.
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