Ghost of a flea

"It's not just the location and the heat, it's the geology and the biology," he said. "This is the type of biology that they think, if it exists on other planets, that's what it would look like. There are a lot of fossils billions of years old." The region is known for its radioactive thermal springs, gibber plains, fossils and extinct lakes, which are considered to have "astrobiological significance".