Earth's magnetic field has protected our atmosphere from erosion by the solar wind ever since it started up. Silicate crystals from some of Earth's oldest rocks date that event to more than 3 billion years ago.
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J. A. TARDUNO
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Dunlop, D. A more ancient shield. Nature 446, 623–625 (2007). https://doi.org/10.1038/446623a
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DOI: https://doi.org/10.1038/446623a
