There was a time when the planet was crawling with enormous dinosaurs, the next, a six-mile-wide asteroid hit, and life changed forever. Almost 66 million years ago, nearly three-quarters of all ...

When the 7.5-mile-wide Chicxulub asteroid smashed into Earth 66 million years ago, it killed most living creatures within hundreds of miles of the impact site. In the chaotic aftermath of the strike, ...