Managers overseeing launch preparations of the SpaceX Falcon 9 rocket and NOAA's DSCOVR have given a "go" for propellant loading. The operation is scheduled to take place at T-3 hours, about 3:03 p.m. EST. Liquid oxygen and RP-1, a rocket-grade kerosene, will be fed into separate tanks aboard each of the Falcon's two stages. Weather …