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APTOPIX Earth At Nigh_Hass.jpg

The United States is see at night in a composite from April and September 2012. The image was made possible by the new satellite's "day-night band" of the Visible Infrared Imaging Radiometer Suite (VIIRS), which detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe dim signals such as city lights, gas flares, auroras, wildfires, and reflected moonlight. (AP Photo/NASA)