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NASA photos: Cities at night

By: Catie Leary on Oct. 16, 2009, 11:22 p.m.
NASA photos: Cities at night, Denver, Colorado

Photo: NASA

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Denver, Colo.

In many North American cities, older neighborhoods have less regular street patterns and light-green mercury vapor lighting, while newer cities, like Denver, have street patterns aligned to the compass directions and use orange sodium vapor lighting. The major Denver street patterns, as seen in this photo taken on Jan. 31, 2008, are rectilinear, aligned north-south and east-west.