BOULDER, Colo. — A massive star exploded around 13,000 years ago, and research now suggests that the cosmic blast may have plummeted Earth into a sudden ice age while wiping out woolly mammoths, giant ...
The 'Big Freeze', or more formally the 'Younger Dryas stadial', is a roughly 1300 year time-span — between 12,800 years ago and 11,500 years ago — when the planet suddenly reverted back to ...
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