1. Earth Had a Magnetosphere 3.7 Billion Years Ago Universe Today
  2. Earth's magnetic field is much older than previously believed Earth.com
  3. Researchers find oldest undisputed evidence of Earth's magnetic field Phys.org
  4. Ancient Rocks Reveal Earth's Magnetic Field Existed 3.7 Billion Years Ago ScienceAlert
  5. Earth's magnetic field formed before the planet's core, study suggests Livescience.com



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Earth Had a Magnetosphere 3>7 Billion Years Ago - Universe Today