Claims › Younger Dryas & the 12,000-year cycle
Younger Dryas & the 12,000-year cycle
About 12,900 years ago the warming world dropped back into near-glacial cold for about 1,200 years. That event is measured. Whether a comet triggered it is contested, and the newest papers on both sides include several retractions. Bigger ideas, such as a lost Ice Age civilisation or a recurring 12,000-year catastrophe, are presented neutrally as Leading Edge.
Our sister site Solar Evidence covers the solar and geophysical side: the solar micronova evidence review and the Geomagnetic Field & Pole Shift section, including crustal displacement and ECDO.
On Solar Evidence: Solar micronova evidence review · Geomagnetic Field & Pole Shift · Crustal displacement · ECDO
Claims in this section
| Claim | Status | Verdict |
|---|---|---|
| An abrupt cold snap, the Younger Dryas, hit about 12,900 years ago As the last Ice Age was ending, the Northern Hemisphere plunged back into near-glacial cold for about 1,200 years, then warmed abruptly 11,700 years ago. | Mainstream | Measured: c. 12,900–11,700 years ago |
| A comet impact or airbursts triggered the Younger Dryas about 12,800 years ago Earth passed through the debris of a fragmenting comet about 12,800 years ago. Airbursts and impacts caused widespread fires, an 'impact winter', megafaunal... | Contested | Open question; several key papers retracted 2025–26 |
| An advanced civilisation existed during the last Ice Age and was lost in a catastrophe A technologically capable civilisation flourished before about 12,000 years ago, was largely destroyed by the Younger Dryas catastrophes and rising seas,... | Leading Edge | Open question |
| Earth suffers a recurring catastrophe about every 12,000 years Global catastrophes recur on a cycle of roughly 12,000 years, possibly driven by solar outbursts (a 'micronova'), crustal displacement or a core–mantle... | Leading Edge | Open question |
Sites in this section
Göbekli Tepe · Great Sphinx of Giza · Yonaguni Monument
Labels describe claims, not people. Leading Edge entries marked "Open question" present the proponents' case and the mainstream position neutrally. How labels work.