Particles and gases from an asteroid impact 66 million years ago blocked the sun for decades, causing permanent winters that wiped out most of the dinosaurs, according to findings published in Proceedings of the National Academy of Sciences. The study, which modeled geological and climate data, rules out volcanic eruptions as a possible cause of the extinction.
Sign up for Sigma Xi SmartBrief
News on scientific research and innovation
Get the intelligence you need: news and information that is changing your industry today, hand-curated by our professional editors from thousands of sources and delivered straight to your inbox.