1. “On this planet there would basically be a thin layer below the surface which will have both graphite and diamond,” lead author on the paper Nikku Madhusudhan told Universe Today. “But, below that there will be a thick layer (a third of the radius) with mostly diamond. For a large part the diamond will be like the diamond on Earth, except really, really pure. But at greater depths the diamond could also be in liquid form.” (via New Exoplanet Is Twice Earth’s Size — and Made Largely of Diamond | Wired Science | Wired.com)