Video: Falcon 9 rocket fires engines in pre-launch test (members only)

SpaceX has pushed back the liftoff of a Bulgarian television broadcast satellite on the company’s second previously-flown Falcon 9 rocket until at least Friday, giving ground crews time to replace a valve on the launcher inside a hangar at its Florida launch pad.

SpaceX’s first Crew Dragon spacecraft wrapped up its five-day stay at the International Space Station at 2:31 a.m. EST (0731 GMT) Friday with a smooth undocking, then nailed an on-target splashdown in the Atlantic Ocean east of Florida at 8:45 a.m. EST (1345 GMT).

A critical test-firing of the Space Launch System’s core stage engines cut off about a minute into a planned eight-minute burn Saturday on a test stand at NASA’s Stennis Space Center in Mississippi. The rocket’s four engines ignited at 5:27 p.m. EST (2227 GMT) for a test that was to pave the way for the core stage’s shipment to the Kennedy Space Center for launch preparations.