Read more: CITY & URBAN, SPACE
NASA photos: Cities at night
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Hundreds of kilometers up
To an observer in space, humanity’s footprint on the surface of the Earth is large and varied. Astronauts circling the Earth have the perfect vantage point, taking in whole regions at once. Onboard cameras and a bit of experimentation allow astronauts to take highly detailed images of the world's cities at night and share them with the rest of us.
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