Analysis of ocean sediments has surfaced geochemical clues in line with the possibility that an encounter with a disintegrating comet 12,800 years ago in the Northern Hemisphere triggered rapid cooling of Earth’s air and ocean. Christopher Moore of the University of South Carolina, U.S., and colleagues present these findings in the journal PLOS One on August 6, 2025.



Summary

A study of ocean sediments suggests a disintegrating comet impact in the Northern Hemisphere 12,800 years ago may have caused rapid cooling of Earth’s atmosphere and oceans. Researchers, led by Christopher Moore, analyzed geochemical evidence in sediment layers corresponding to that period. The findings, published in PLOS One on August 6, 2025, support the controversial Younger Dryas impact theory, which posits a cosmic event triggered the abrupt climate shift known as the Younger Dryas stadial. This event potentially initiated a period of significant cooling, impacting ecosystems and human populations.

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