TEXT: """NASA satellite image shows the United States, Mexico and Canada at night in this composite assembled from data acquired by the Suomi NPP satellite in April and October 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. REUTERS/NASA/Robert Simmon/NOAA/Department of Defense/Handout (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS"""