About 66 million years ago, a 6-mile wide asteroid smacked into Earth. It was enough to kill off three-quarters of life on the planet
World - CBSNews.com, CBS News: World
Wed, 02/07/2018 - 3:57pm
About 66 million years ago, a 6-mile wide asteroid smacked into Earth. It was enough to kill off three-quarters of life on the planet