The Asteroid That Killed Dinosaurs Was 10 km Wide and Hit at 72,000 km/h
About 66 million years ago, an asteroid roughly 10 kilometres wide struck the Yucatán Peninsula in present-day Mexico at the Chicxulub crater site. Travelling at around 72,000 km/h, it released energy equivalent to billions of atomic bombs, triggering wildfires, a years-long nuclear winter, and the extinction of about 75% of all species — including all non-avian dinosaurs.