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North America at night, satellite image. City lights (yellow) show areas of dense population, particularly in North America (upper centre). Most of South America (bottom right) is uninhabited, as is the Arctic (top). This image was produced by combining data from the Defense Meteorological Satellite Program (DMSP) and NOAA's POES satellites. (KEYSTONE/SCIENCE PHOTO LIBRARY/PLANETARY VISIONS LTD/SCIENCE PHOTO LIBRARY)