The United States Geological Survey uses satellite photos for all kinds of research into agriculture, weather, climate change, geology, and more. But those same photos are sometimes just stunningly beautiful. So, the Earth Resources Observation and Science (EROS) Center put together a gallery of its most aesthetically appealing images. You're looking at one of them here. That's cloud formations over the Aleutians Islands off the coast of Alaska. The color variations derive from the shape and size of the water droplets that form the clouds.