April 30 (UPI) -- SpaceX's launch of a spy satellite aboard a Falcon 9 was postponed less than a minute before liftoff Sunday in Florida when the launch company detected an issue with a sensor on the rocket's first stage.
With 52 seconds remaining before liftoff at 7:15 a.m. EDT, SpaceX called a 24-hour hold to check out the sensor, pushing the launch to Monday's two-hour backup window starting at 7 a.m.