Update: August 2, 8:45 a.m. ET: Northrop Grumman successfully executed its 19th resupply mission (NG-19) to the ISS under NASA’s Commercial Resupply Services-2 contract, using the company’s Antares 230+ rocket. The launch vehicle blasted off at 8:31 p.m. ET, sending the Cygnus cargo spacecraft, named S.S. Laurel Clark…