The artificial light from human settlements appears with a characteristic yellow tinge. The green light of the aurora borealis also shines brightly in this view—even seeming to reflect off Earth’s surface in Canada. A small white patch of light is almost certainly lightning from a storm on the East coast (image top right). Part of the ISS appears across the top of the image. This astronaut photograph highlights the Chicago metropolitan area as the largest cluster of lights, next to the dark patch of Lake Michigan. The other largest metropolitan areas include St. Louis, Minneapolis–St. Paul, and the Omaha–Council Bluffs region on the Nebraska–Iowa border. The northeastern seaboard lies just beyond the Appalachian Mountains, a dark winding zone without major cities.
City light clusters give an immediate sense of relative city size. Demographers have used nighttime satellite imagery to make estimates of city populations, especially in the developing world, where growth can be rapid.
The sense of scale changes significantly in oblique views. Des Moines is 200 kilometers from Omaha and 375 kilometers from Minneapolis, yet the distances appear roughly the same in this view
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