Earth's Magnetic Field Nearly Disappeared 565 Million Years Ago
Five hundred and sixty-five million years ago, Earth's magnetic field almost disappeared. But a geological phenomenon might have saved it, a new study suggests. Earth's then-liquid core likely began to solidify around that time, which strengthened the field, the group reported yesterday (Jan. 28) in the journal Nature Geoscience. This is important because the magnetic field protects our planet and its inhabitants from harmful radiation and solar winds — streams of plasma particles thrown our way by the sun.
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