Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A layer of diamonds ...

NASA's MESSENGER mission has revealed that Mercury, the solar system's tiniest planet and the closest to the sun, hides a big secret. When you purchase through links on our site, we may earn an ...

Scientists have made an astonishing discovery about Mercury, the smallest and innermost planet in our solar system: some of its core might be made of diamonds. This revelation comes from a recent ...

An excess of carbon on the planet means that Mercury 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 ...

A layer of diamonds up to 18 kilometers (11 miles) thick could be tucked below the surface of Mercury, the solar system's smallest planet and the closest to the sun, according to new research. The ...