US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
USA at night. Colour-coded satellite image of the city lights of the United States of America at night. North is at top. The colour-code ranges from purple (low intensity), through blue and yellow to red (high intensity). The eastern half of the country is more heavily populated than the western half. This image was produced by the American Defense Meteorological Satellite Program (DMSP) spacecraft.
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