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Journey back 3.7 billion years and discover the groundbreaking find hidden within ancient rocks from the Isua Supracrustal Belt in Greenland. A new study, co-led by the University of Oxford and MIT, has uncovered the oldest undisputed evidence of Earth's magnetic field. By examining iron particles locked within these incredibly old rocks, which act like tiny magnets recording magnetic field strength and direction, researchers found that Earth had a magnetic field with a strength of at least 15 microteslas. This is a significant finding because it shows the planet had a robust magnetic shield very early in its history, with a strength comparable to about half of the modern magnetic field's 30 microteslas. This discovery raises fascinating questions about how the ancient Earth powered its magnetic field, as the source might have been different from the crystallization of the solid inner core that powers it today. A strong magnetic field is considered crucial for planetary habitability, as it shields a planet from harmful solar wind and helps it retain a life-sustaining atmosphere. The findings suggest that the presence of this magnetic field billions of years ago could have played a vital role in Earth fostering life and the evolution of its atmosphere. Understanding this ancient magnetic field is also key to assessing the potential for habitability on other terrestrial planets throughout the galaxy. Researchers plan to investigate other ancient rock sites to learn more about the field before the rise of oxygen. P. Geo. Ricardo A Valls, M. Sc. and Geo Gadfly Valls Geoconsultant ORCID ID- https://orcid.org/0000-0002-5421-0914 Scopus Author ID: 7003369619/35335510700 ResearcherID: S-6604-2018 If you like this content, please "buy me a coffee" https://www.buymeacoffee.com/goldendroplets