Iron Snow Ebb and Flow May Cause Magnetic Fields to Come and Go

Source: Geophysical Research Letters

Just as snow crystals form in the upper atmosphere, then fall to lower, warmer elevations and melt, scientists believe a phenomenon called iron snow happens in the molten iron cores of some planetary bodies: Cooling near the core-mantle boundary creates crystals of iron, which melt as they fall deeper into the hot core. This movement may…