As autumn gives way to winter across the Arctic, the ground doesn't immediately freeze solid. Instead, soils often linger near the freezing point for days or even weeks in a phase called the zero curtain. In a new NASA-led study, researchers produced high-resolution maps of the Arctic zero curt...
Source: [Phys.org](https://phys.org/news/2026-08-ai-reveals-hidden-stage-arctic.html)