Mercury may have 11-mile deep layer of diamonds

The homely rocky surface of the closest planet to the Sun may hide a sparkling secret: a layer of diamonds compressed within. Researchers suggest it might be 11 miles deep.

The diamonds might have formed soon after Mercury itself coalesced into a planet about 4.5 billion years agofrom a swirling cloud of dust and gas, in the crucible of a high-pressure, high-temperature environment.

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