SpaceX halted the countdown for its Falcon 9 launch at Cape Canaveral on Sunday, citing a helium issue. The scrub occurred just two minutes and thirty-six seconds before the scheduled liftoff for the Starlink mission, which was set to deploy 23 more internet satellites. SpaceX now says they will try again on Tuesday, with the launch window opening at 4:05PM and closing tomorrow at 8:05PM. Meanwhile, a NASA resupply mission to the International Space Station is still on schedule for tonight at 9:29PM from the Kennedy Space Center. The first stage booster will flip around after separation, and then return for a landing at Cape Canaveral about 8 minutes after liftoff,… meaning we are in for some sonic booms this evening.