The controversial Younger Dryas Impact Hypothesis, which was featured in the Netflix series Ancient Apocalypse, is based on the idea that a comet exploded over the Earth and triggered a period of abrupt climate cooling and species extinctions.
But the idea is widely debated, and it is more generally accepted that the cooling was caused by glacial meltwater. The researchers, however, say they have found evidence of this impact in deep marine sediments from Baffin Bay off the coast of Greenland.
The analysis detected metallic debris whose geochemistry is consistent with comet dust. These occurred alongside microscopic spherical particles whose composition indicates a mostly terrestrial origin, with some materials believed to be extraterrestrial–suggesting these microspherules could have formed when comet fragments exploded just above or upon hitting the ground, melting materials together. The analysis also uncovered even smaller nanoparticles with high levels of platinum, iridium, nickel, and cobalt, which can be signs of extraterrestrial origin.
Together, these findings indicate a geochemical anomaly occurring around when the Younger Dryas event began. However, they do not provide direct evidence supporting the impact hypothesis. More research is needed to confirm whether the findings are indeed evidence of impact, and to firmly link an impact to climate cooling.
