A new study shows a volcanic eruption of Yellowstone may be even less likely than we thought: Scientists have discovered a magma cap that may play a role in relieving volcanic pressure underground.

Yellowstone's supervolcano appears to have a magma cap that vents pressure and reduces the chances of a massive eruption happening anytime soon.

Ever been mesmerized by the swirling colors of Grand Prismatic Spring and wondered what fuels that otherworldly boil? It turns out that beneath the wild expanse of Yellowstone National Park lies one of the most closely watched volcanic systems on Earth.