Live coverage: Falcon 9 disintegrates after launch

A top secret payload developed in secrecy for the U.S. government is set to ride into orbit from Florida’s Space Coast aboard a SpaceX Falcon 9 rocket Thursday.

The four-person crew will launch onboard Dragon Endeavour from pad 39A at NASA’s Kennedy Space Center. It will be the first time a SpaceX Crew Dragon capsule has flown for a sixth time.

SpaceX test-fired a Falcon 9 rocket Wednesday afternoon at NASA’s Kennedy Space Center in Florida, clearing a major hurdle before it launches Saturday night — weather permitting — with a four-person crew heading for the International Space Station.