You wouldn’t want much to do with Chile’s Atacama Desert today. Officially designated the driest place in the world, it has an average annual rainfall of just 15 mm (0.6 in.). Some parts of the 103,000 sq. km (40,500 sq. mi) expanse get no rain at all. But 12,000 years ago, at the end of…

A Comet May Have Exploded Over Chile 12,000 Years Ago—and it Could Happen Again