There’s something new in Yellowstone National Park, and it’s hot and corrosive. It’s also, “been sneaking up on the park for the last 20 years,” and has grown to be the size of four soccer fields, said Greg Vaughan, a research scientist with the Yellowstone Volcano Observatory.
That’s not anything to worry about. Carved by ancient volcanic activity and peppered by ever-changing, kaleidoscopic natural beauty, Yellowstone, the world’s oldest national park, is monitored extremely closely by scientists. As it covers a whopping 3,472 square miles of land across three different states, you can’t expect them to spot every single new natural feature the moment it appears.