Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help ...

French President Emmanuel Macron has issued a stark warning to Europe, urging the continent to rapidly develop new long-range strike weapons in response to Russia’s Oreshnik missile, which has already ...

A long quiet volcano in Ethiopia has roared back to life, blasting ash roughly 9 miles into the sky and catching both nearby ...

A supermassive black hole is reawakening inside a distant galaxy cluster—and after almost 100 million years of slumber, ...