Baby, it’s icy outside. 🧊 This icefield of the southern Andes mountains was captured by an astronaut aboard the International Space Station (ISS). The mountain peaks here reach high enough and temperatures remain cold enough year-round that permanent ice persists amid a warming world. It was significantly larger about 18,000 years ago, during the coldest phase of the last Ice Age, covering almost the entire view in this image—an enormous area considering that the present icefield is more than 100 kilometers (60 miles) long. Glacial ice moves slowly downhill under its own weight. As it flows, it cuts valleys into the underlying rocks. There have been several ice ages in the past, and scientists now know that the lakes at the top of this image and the network of valleys (fjords) at the bottom were gouged out by the erosion of moving glacial ice when the icefields were much larger. In a recently published survey of glaciers, scientists showed that the Patagonian icefields follow the g...