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 come after the impact itself was already over - Space Daily

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 wh…