About 66 million years ago, an asteroid roughly 10 to 12 kilometres across struck a shallow, sulfur-rich carbonate platform near what is now Chicxulub, on Mexico’s Yucatán Peninsula. It opened a crater close to 180 kilometres wide and marks the boundary at which around three-quarters of species in the fossil record disappear, the non-avian dinosaurs [...] The post The asteroid that ended the dinosaurs did not just leave a crater, it turned the sky into a weapon, and the worst damage may have co