Live coverage: Ariane 5 rocket soars with Sky Muster, Arsat 2

The U.S. Air Force’s fourth Advanced Extremely High Frequency spacecraft launched Wednesday from Cape Canaveral on top of a United Launch Alliance Atlas 5 rocket, expanding the reach of the military’s most secure, jam-resistant satellite communications network.

SpaceX called off a planned launch attempt Saturday to deploy the next batch of satellites for the Starlink broadband network. Two commercial Earth-observing satellites for BlackSky are also awaiting a ride into orbit on the Falcon 9 rocket from pad 39A at the Kennedy Space Center in Florida.

The Falcon 9 first stage booster assigned to launch as soon as March on SpaceX’s first mission with a previously-flown rocket has been test-fired at the company’s development facility in Central Texas.