The Southern U.S. at Night: A Network of Light

astronaut photograph, ISS — The southeastern part of the South glows at night, including the eastern Gulf of Mexico and lower Atlantic Seaboard states. (Image credit: NASA/JSC)

The southern United States is known for its distinctive cultural and historical identity within the country, including distinct music, cuisine, literature, and social customs. The U.S. Census Bureau defines “The South” as including the states of Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, and West Virginia.

This astronaut photograph from the International Space Station highlights the southeastern part of the South at night, including the eastern Gulf of Mexico and lower Atlantic Seaboard states. The view is part of a time-lapse series of images that extends from just southwest of Mexico to northeast of Newfoundland, Canada. New sequences from the Space Station are regularly posted on the Crew Earth Observation videos page.

Following the American Civil War (1861-1865), the southern U.S. continued to be mostly agrarian until the latter half of the 20th century, when increased migration from other areas of the country and immigration from outside the U.S. led to increased urbanization. The brightly lit metropolitan areas of Atlanta, Georgia (image center) and Jacksonville, Florida (image lower right) appear largest in the image, with numerous other urban areas forming an interconnected network of light across the region.

A large dark region to the northwest of Jacksonville is the Okefenokee National Wildlife Refuge. Likewise, the ridges of the Appalachian Mountains form dark swaths to the north of Atlanta and west of Charlotte, North Carolina (image center). The faint gold and green line of airglow—caused by ultraviolet radiation exciting the gas molecules in the upper atmosphere—parallels the horizon (or Earth limb).

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