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The Visible Infrared Imaging Radiometer Suite (VIIRS) sensor was launched aboard the Suomi National Polar-orbiting Partnership (NPP) satellite on October 28th, 2011 and on January 18th, 2012 cooler doors for the thermal sensor were opened. A second VIIRS sensor is flown aboard the NOAA-20 satellite (formerly JPSS-1), launched November 18, 2017. These two satellites follow the same orbital path, separated by 50 minutes. The VIIRS sensor is scheduled to be flown on future satellite missions, providing Earth observations continuity.