Frequent storms on the young Sun would have ejected energetic particles and compressed Earth's magnetosphere. Simulations suggest that the particles penetrated the atmosphere and initiated reactions that warmed the planet and fertilized life.
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Ramirez, R. Atmosphere's solar shock. Nature Geosci 9, 413–414 (2016). https://doi.org/10.1038/ngeo2728
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DOI: https://doi.org/10.1038/ngeo2728