Statistical analysis has revealed a simple rule for the occurrence of warm periods during the Quaternary, whereas on much longer timescales geological data have confirmed that the Solar System is chaotic. See Article p.427 & Letter p.468
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Paillard, D. Predictable ice ages on a chaotic planet. Nature 542, 419–420 (2017). https://doi.org/10.1038/542419a
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DOI: https://doi.org/10.1038/542419a