Pluto's Strange Ridges Formed From Ancient Glaciers

Scientists have traced strange landforms on Pluto back to their ancient glacial origins.A letter by SETI Institute scientist Oliver White and colleagues shows how ridged landforms on Pluto provide evidence for glaciers on the dwarf planet some 4 billion years ago. Their research targeted the landscape that borders the ice-covered impact basin Sputnik Planitia - the western portion of Pluto's "heart." It has noticeable ridges that can’t be explained by any simple terrestrial or planetary