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NASA photos: Cities at night

NASA photos: Cities at night, Seoul, South Korea

Photo: NASA

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Seoul, South Korea

In this photo of Seoul, South Korea, taken on Dec. 25, 2004, major roadways and river courses (such as the Han River) are clearly outlined by street lights, while the brightest lights indicate the downtown urban core (center of image) and large industrial complexes. Very dark regions in the image are mountains or large bodies of water.