Yale researchers may have solved a longstanding puzzle as to why certain metallic meteorites show traces of a magnetic field - a finding that may shed light on the formation of magnetic dynamos at the core of planets. Planetary magnetism is key to understanding both the internal structure and evolution of many celestial bodies. The cores of Earth, Mercury, and two of Jupiter's moons, Ganymede and Io, for example, all generate detectable magnetic fields. And there are traces of ancient magnetism found on Mars and Earth's moon.

https://www.miragenews.com/magnetic-field-mystery-in-space-1058172/

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