Weird Shapes on Pluto Hint at Icy 'Face-Lift' Over Time

Strange geometric shapes miles wide seen on Pluto's icy surface likely formed because of a churning sheet of frozen nitrogen more than a half-mile thick, two new studies find. The findings reinforce the idea that Pluto is not cold and dead but surprisingly geologically active, the researchers say. The findings could shed light on how other icy dwarf planets far beyond Pluto in the solar system might behave, the researchers added.