When I first spotted this stunning image on NASA’s Earth Observatory site, it stopped me dead in my tracks. It’s a view over Lake Powell on the Colorado River, the second-largest artificial reservoir in the United States, after Lake Mead further downstream.
Almost the entire lake is visible in this photograph, taken by an astronaut aboard the International Space Station last September. I was really struck by the clarity, the color, and the oblique angle at which it was taken. The photogra