The asteroid that wiped out the dinosaurs may have created a vast underground habitat for life that lasted 8 million years

The asteroid impact that doomed the dinosaurs may also have built one of Earth's longest-lasting underground ecosystems. When a roughly 6-mile-wide (10-kilometer-wide) asteroid slammed into what is now Mexico's Yucatán Peninsula 66 million years ago, it triggered a global catastrophe that wiped out about 75% of life on Earth, including all non-avian dinosaurs. …