月球背面发现古代磁场证据

A buried volcanic formation on the Moon’s far side is offering fresh evidence that our nearest celestial neighbor once generated its own magnetic field. By combining gravity measurements with magnetic observations, researchers have reconstructed a subsurface structure that appears to preserve a record from roughly 4.2 billion years ago. The study, published in Science Advances, points to an ancient field exceeding 11 microtesla. That is a substantial strength for a small world whose ability to sustain a magnetic dynamo remains disputed. The finding comes from the Dewar region, where unusually strong magnetism coincides with a gravity anomaly. …