Magnetic minerals in ancient Greenlandic rocks suggest that Earth’s magnetic field arose at least 3.7 billion years ago. Recent study pushes back the estimate for the magnetic field’s birth by about 200 million years than the commonly accepted estimate - around the time when the first life appeared on Earth.
Scientists think that having a magnetic field makes Earth more hospitable to life. The field, which is generated by liquid iron sloshing in the planet’s core, shields Earth from energetic particles flowing from the Sun. It helps the planet hold onto its atmosphere and maintain liquid water on its surface.
But very few rocks that are billions of years old, and thus could preserve evidence of when the magnetic field arose, have survived to the present day. The new report is a rare glimpse at what Earth was like billions of years ago.
Meanwhile, we have beautiful sunshine today in Southern Spain with 23 Centigrade and 18% humidity. Wind: 11 KH from the West. How are conditions on your part of the planet? Comment below, including your location. It is always great to hear the local perspectives from our global community.
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