Study: Uranus & Neptune Have Seas of Diamond—With Diamond Icebergs

Both Uranus and Neptune have quirky magnetic poles—they're located about 60 degrees off the geographic pole rather than very nearby, like ours is. The reason, researchers suggest in a new Nature Physicsstudy, could be that oceans of diamond—yes, oceans of diamond—cover our solar system's two most distant planets. The diamond idea isn't a new one, but it's a terribly hard question to study because you have to get diamond to melt in the lab to study it, and this experiment was the first to document the pressure and temperature at which that happens. The mineral is notoriously hard, of course, but there's something more: