SpaceX's Falcon Heavy launch of secretive X-37B space plane delayed due to ground issue

SpaceX has postponed the launch of the U.S. Space Force's X-37B space plane atop its Falcon Heavy rocket due to a ground issue. The launch, known as USSF-52, was scheduled for Monday night but has been rescheduled for the next available launch opportunity. The X-37B mission will be the first to ride atop a Falcon Heavy and aims to operate in new orbital regimes, experiment with space domain awareness technologies, and investigate radiation effects on NASA materials.