SpaceX is preparing to launch 27 Starlink satellites on a Falcon 9 rocket.The mission, named Starlink 11-13, will be the 25th Starlink flight this year.The liftoff is scheduled for 4:39 p.m. PDT from Vandenberg Space Force Base.The Falcon 9 first stage booster will be making its fifth launch and attempt a landing on a droneship.