![A rendered photo of Mercury with rainbow colors across its surface](https://cdn.mos.cms.futurecdn.net/ygDyXubaZeVyML3msWUUhK-320-80.jpg)
9 miles of solid diamonds may lurk beneath Mercury's surface, new study finds
New simulations suggest that a 9-mile-thick layer of diamonds may lurk deep below the surface of Mercury. The gems almost certainly can't be mined for bling — but they may help solve some of the planet's biggest mysteries.