Given that the Sun was dimmer in its youth, our planet should have been frozen over for much of its early history. That it evidently wasn't is a puzzle that continues to engage the attention of Earth scientists.
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Kasting, J. Faint young Sun redux. Nature 464, 687–689 (2010). https://doi.org/10.1038/464687a
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DOI: https://doi.org/10.1038/464687a
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