Did a Massive Extraterrestrial Body Impact Earth 12,000 Years Ago? (Weekend Feature)

Did a Massive Extraterrestrial Body Impact Earth 12,000 Years Ago? (Weekend Feature): "New research results are consistent with a controversial theory that an extraterrestrial body – such as a comet – impacted the Earth approximately 12,900 years ago, possibly contributing to the significant climatic and ecological changes that date to that time period. The paper in the Proceedings of the National Academy of Sciences (PNAS) includes significant findings about the nature of so-called "microspherules" that were found at a number of prehistoric sites, based on research done at North Carolina State."