This image of Earth's city
lights, captured on October 19, 2000, was created with data from the
Defense Meteorological Satellite Program (DMSP) Operational Linescan
System (OLS). The brightest areas of the Earth are the most urbanized,
but not necessarily the most populated. Cities tend to grow along
coastlines and transportation networks. The United States interstate
highway system appears as a lattice connecting the brighter dots of city
centers. In Russia, the Trans-Siberian railroad is a thin line
stretching from Moscow through the center of Asia to Vladivostok. The
Nile River, from the Aswan Dam to the Mediterranean Sea, is another
bright thread through an otherwise dark region.
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