Earth’s City Lights (DMSP, 1994–1995). Data: Marc Imhoff/NASA GSFC and Christopher Elvidge/NOAA NGDC. Image: Craig Mayhew and Robert Simmon/NASA GSFC. Via Wikimedia Commons; source page marks it public domain in the United States. Accessed September 7, 2026.
https://commons.wikimedia.org/wiki/File:Earth%27s_City_Lights_by_DMSP,_1994-1995_(large).jpg