Lake Superior, from Space

  Picture it: the International Space Station, where astronauts frequently observe atmospheric and surface phenomena in ways that are impossible to see from our vantage point on the ground. In the above photograph of northeastern Lake Superior, astronauts documented two of those phenomena—gravity waves and sunglint. From NASA, who posted the photo: At the top…

Signs of spring

  Snow melting on the sand dunes of the Great Sand Dunes National Park.