“We knew that every solar system body with an atmosphere and a solid rocky surface has dunes on it, but we didn’t know what we’d find on Pluto," Matt Telfer, lecturer in physical geography at the University of Plymouth and the paper’s lead author. "It turns out that even though there is so little atmosphere, and the surface temperature is around minus 230 degrees Celsius, we still get dunes forming… It is another piece of the jigsaw in making sense of this diverse and remote body.”

Radebaugh and team think that methane ice, which caps Pluto’s heart along with nitrogen ice, breaks up into the fine sand-like particles. Nitrogen sublimation—where the solid becomes a gas—might be kicking these methane particles into the air, where the relatively light winds of Pluto can grab them and pile them up high between the border of the glacier and the mountains. “This is one of the windiest spots on Pluto,” Telfer told the Washington Post, “and the winds are in exactly the right direction.”

Other explanations for the dunes might include increases in atmospheric pressure, William McKinnon, of Washington University in St Louis, told the Post.

“It’s an exciting discovery, I’ll say that for sure,” Ryan Ewing, a geologist at Texas A&M University who was not involved with the paper, told the Post. “The way that they’re recognizing the dunes on the surface is the same technique we’ve used to identify dunes on Mars.”

"It's a really young and interesting and dynamic surface," added Radebaugh in the statement. "Pluto, it turns out, is a lot like Mars or somewhere where we think, 'oh, it's not quite as cold and dead as we might have thought.'"