Oldest Evidence of Earth’s Magnetic Field

Geologists from MIT and Oxford University have unearthed the oldest evidence of Earth’s magnetic field in 3.7 billion-year-old rocks from Greenland. This discovery suggests that Earth might have been habitable much earlier than previously thought, primarily due to the stabilizing effect of a magnetic shield that protected the planet from solar radiation and cosmic rays, thus maintaining an atmosphere and liquid water necessary for life. This finding not only pushes back the timeline of Earth’s magnetic history but also offers insights into the early conditions that could have supported life, influencing future studies on planetary habitability and life’s origins.