Update 11:56 p.m.: SpaceX's launch webcast is now posted above, right below our countdown clock. Liftoff is scheduled in four minutes from Cape Canaveral Space Force Station. SpaceX to launch ISS resupply mission next week Update 11:49 p.m.: A week from Monday, NASA and SpaceX will team up to launch a Dragon spacecraft on a Falcon 9 on the company's 32nd commercial resupply services mission to the International Space Station. The rocket may launch as early as 4:15 a.m. April 21 from pad 39A at Kennedy Space Center. "Along with food and essential equipment for the crew, Dragon is delivering a variety of experiments, including a demonstration of refined maneuvers for free-floating robots," a NASA press release said. "Dragon also carries an enhanced air quality monitoring system that could protect crew members on exploration missions to the Moon and Mars, and two atomic clocks to examine fundamental physics concepts, such as relativity, and test worldwide synchronization of precision timepieces," the press release said. SpaceX booster to land 8 minutes, 13 seconds after liftoff Update 11:39 p.m.: Following stage separation, SpaceX technicians expect the first-stage booster to land on the SpaceX drone ship Just Read the Instructions in the Atlantic Ocean 8 minutes, 13 seconds after liftoff. SpaceX Falcon 9 fueling is now underway Update 11:29 p.m.: Falcon 9 fueling procedures are now underway at Launch Complex 40, as evidenced by white water vapor beginning to billow near the base of the rocket. That means the Starlink mission countdown is locked in to lift off at 12 a.m. Monday without any delays, or else the launch must be postponed to a later date. SpaceX Falcon 9 rocket launch countdown Update 11:15 p.m.: Here's a rundown of SpaceX’s upcoming behind-the-scenes Falcon 9 launch countdown timeline. T-minus: 38 minutes: SpaceX launch director verifies “go” for propellant load. 35 minutes: Rocket-grade kerosene and first-stage liquid oxygen loading begins. 16 minutes: Second-stage liquid oxygen loading begins. 7 minutes: Falcon 9 begins engine chill prior to launch. 1 minute: Command flight computer begins final prelaunch checks; propellant tank pressurization to flight pressure begins. 45 seconds: SpaceX launch director verifies “go” for launch. 3 seconds: Engine controller commands engine ignition sequence to start. 0 seconds: Liftoff.