Researchers are saying the supervolcano sitting beneath Yellowstone National Park could erupt sooner than thought -- and could possibly plunge the planet into a "volcanic winter."
It's been roughly 631,000 years since Yellowstone's last super-eruption and, until now, scientists thought it would take centuries for the supervolcano to make the transition, according to National Geographic.
Now, after analyzing minerals in fossilized ash from Yellowstone, researchers from Arizona State University are saying the lava-filled mountain could erupt in just a few decades.