A new study, led by the University of Oxford and MIT, has recovered a 3.7-billion-year-old record of Earth's magnetic field, and found that it appears remarkably similar to the field surrounding Earth today. The findings have been published in the Journal of Geophysical Research.
Researchers find oldest undisputed evidence of Earth's magnetic field retrieved 24 April 2024 from https://phys.org/news/2024-04-oldest-undisputed-evidence-earth-magnetic.html
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