Caption: 
Researchers for an SwRI-led study compared New Horizons images to NASA Landsat 9 images of the Greenland ice sheet. Dark, narrow surface features have been identified here in areas in Greenland where liquid water darkens the ice and snow in a manner analogous to what is now believed to perhaps be occurring on northern Sputnik Planitia on Pluto due to present or recent liquid nitrogen there. The newly-published Pluto study identifies very similar features in the northern edge of Pluto’s Sputnik Planitia glacier, suggesting the recent presence of liquid nitrogen there. 