A SpaceX Falcon 9 rocket stands vertical on its launch pad at Vandenberg Space Force Base, awaiting liftoff with the first 10 satellites for the U.S. military’s Space Development Agency. Credit: SpaceX
SpaceX aborted a launch attempt Thursday just three seconds before liftoff at the start of the engine ignition sequence, delaying the flight of a Falcon 9 rocket from California with 10 satellites for the U.S. military’s Space Development Agency.

