Iron sulfide may be keeping Mercury’s core toasty and its alive magnetic field

NASA’s MESSENGER spacecraft has detected magnetic signals in Mercury’s surface rocks, and even stronger ones in lower orbit. Red and orange in this image represent the direction of the field lines pointing off-planet, while blue and purple lines point inward. NASA’s Scientific Visualization Studio By Lisa Grossman September 3, 2019 at 12:37 pm Mercury’s core

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