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North America at night. Composite satellite image of the artificial lights of North America, west of the dawn terminator (day-night line). North is at top. Vegetation is green, arid areas are brown, water is blue, clouds are white, and ice & snow are white. The most urbanized areas of North and Central America (centre) are seen. The island chain of Hawaii, the remotest island chain on Earth, is seen at center left. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA)