Uncommon
Younger Dryas impact hypothesis
Fringe hypothesis about a North American comet impact
Younger Dryas impact hypothesis
The Younger Dryas impact hypothesis (YDIH) is a fringe hypothesis that posits that the cause of the disruption of the Atlantic meridional overturning circulation resulting in the onset of the Younger Dryas cooling c. 12,900 years Before Present, was the result of an impact or air burst of a meteor, possibly a comet. The hypothesis has been widely rejected by most relevant experts due to lack of clear evidence for any such impact, with claimed evidence described as self-contradictory, inconsistent, omitting contradictory information, and "sometimes defying the laws of physics." Mainstream hypothesis instead attribute the Younger Dryas onset either to a sudden massive influx of glacial meltwater into the Atlantic Ocean from North America, or to volcanism. YDIH has been popularized in non-academic (particularly conspiracist) circles through its inclusion in several documentaries about ancient history on popular science television, and pseudoscientific books by author Graham Hancock. Hancock...
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