PLANETOBSERVER / SCIENCE PHOTO LIBRARY PLANETOBSERVER / SCIENCE PHOTO LIBRARY
North America, satellite image. Arctic sea ice is white, oceans are blue and land is green and brown. The North Pole is seen at top, with North America at left and Central America at bottom. City lights (yellow) in dark areas show areas of dense population, while those that are more sparsely populated have fewer lights. Image obtained using data from Landsat 5 and Landsat 7 satellites.
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