English: The image depicts the roughly 100-kilometer (60-mile) east-west extent of the Houston metropolitan area. Houston proper is at image center, indicated by a “bull’s-eye” of elliptical white- to orange-lighted beltways and brightly lit white freeways radiating outwards from the central downtown area. Suburban and primarily residential urban areas are indicated by both reddish-brown and gray-green lighted regions, which indicate a higher proportion of tree cover and lower light density. Astronaut photograph ISS022-E-78463 was acquired on February 28, 2010, with a Nikon D3 digital camera and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. The image was taken by the Expedition 22 crew.