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Researchers find oldest undisputed evidence of Earth's magnetic field - EurekAlert
<p>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 today in the <em>Journal of Geophysical Research</em><em>.</em></p>
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