NASA’s Earth Observatory published these before-and-after images of the Tri-state area, which show the power outages caused by the disaster. NASA described the process and how to look at the images, saying:

"Both images were captured by the VIIRS 'day-night band,' which detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe signals such as gas flares, city lights, and reflected moonlight. In the top image, lingering clouds from Hurricane Sandy are lit by moonlight and obscure much of New York’s Hudson Valley, northwestern New Jersey, and northeastern Pennsylvania. […] In Manhattan, the lower third of the island is dark on November 1, while Rockaway Beach, much of Long Island, and nearly all of central New Jersey are significantly dimmer. The barrier islands along the New Jersey coast, which are heavily developed with tourist businesses and year-round residents, are just barely visible in moonlight after the blackout. Along with the scattered electric lights, there is a bright point along the shore south of Mantoloking, New Jersey, that could be fires fueled by severed natural gas lines. Note: It is not clear if the fires reported on October 31 were still burning on November 1." 

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[via Gawker]