Overview
- Researchers reanalyzed high-resolution images from NASA’s 2015 New Horizons flyby and found dark linear streaks and diffuse patches at the northern edge of Sputnik Planitia that resemble wetting on Earth glaciers.
- The paper, published in The Planetary Science Journal on August 6, 2026, presents this as the first evidence interpreted as recent liquid reaching Pluto’s surface.
- Computer models by a study co-author show nitrogen ice at the glacier’s base can melt under pressure and rise through narrow conduits to the surface, producing brief downhill flows that darken the ice.
- Authors say Pluto’s atmosphere is too cold and thin for nitrogen rain, so basal emergence best explains the patterns, but they caution the interpretation rests on image comparison and modeling rather than a direct detection.
- The team calls for higher-resolution mapping of Pluto, laboratory studies of solid and liquid nitrogen at very low temperatures, and future missions to test whether similar activity occurs elsewhere in the Kuiper Belt.