Asteroid may have caused last Ice Age
DOI: 10.1063/PT.5.027312
Nature : About 11 600 to 12 900 years ago, Earth experienced a severe climate change when temperatures dropped by several degrees over less than a century. Despite numerous theories as to why that occurred, growing evidence points to a meteorite or comet strike, which would have started fires, created dust, and melted glaciers. Mukul Sharma of Dartmouth College in Hanover, New Hampshire, and colleagues, whose study appears this week in Proceedings of the National Academy of Sciences, point to the evidence of rock fragments recently found in Pennsylvania. The rocks appear to have been blasted from the ground in Quebec and fused together at temperatures higher than 2000 °C as they flew through the air. Next, Sharma says he plans to find the crater that would have been created had such an impact occurred.
