13,000 Year Ago a 100km Asteroid Triggered an Impact Winter on Earth

12,800 years ago (give or take a few months), pieces of a disintegrating comet hit the Earth and triggered an “impact winter”

Image result for asteroid hitting earth

The Younger Dryas boundary (YDB) cosmic-impact hypothesis is based on considerable evidence that Earth collided with fragments of a disintegrating ≥100-km-diameter comet, the remnants of which persist within the inner solar system ∼12,800 y later. Evidence suggests that the YDB cosmic impact triggered an “impact winter” and the subsequent Younger Dryas (YD) climate episode, biomass burning, late Pleistocene megafaunal extinctions, and human cultural shifts and population declines.

Source: Extraordinary Biomass-Burning Episode and Impact Winter Triggered by the Younger Dryas Cosmic Impact ∼12,800 Years Ago. 1. Ice Cores and Glaciers | The Journal of Geology: Ahead of Print

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