A recent study in Nature Communications by scientists from China and Belgium suggests that Mercury’s core-mantle boundary (CMB) includes a diamond layer, potentially up to 18 kilometers thick, deep within the planet’s interior. A recent study in Nature Communications by scientists from China and Belgium suggests that Mercury’s core-mantle boundary (CMB) includes a diamond layer, potentially up to 18 kilometers thick, deep within the planet’s interior. Planetary Sciences Phys.org – latest science and technology news stories