Live coverage: Ariane 5 blasts off with two Intelsat satellites

SpaceX’s next Falcon 9 rocket ignited its nine Merlin engines at Kennedy Space Center’s launch pad 39A Thursday in a customary pre-flight test ahead of the company’s next mission, slated for Monday with a commercial South Korean-owned communications satellite.

SpaceX’s Dragon supply ship reached the International Space Station on Wednesday, with astronaut Jeff Williams grappling the unpiloted spacecraft with the research lab’s robotic arm at 6:56 a.m. EDT (1056 GMT) after an automated rendezvous.

Running through a practice countdown and hold-down engine firing at NASA’s Kennedy Space Center, a SpaceX Falcon 9 rocket passed a key checkpoint Thursday ahead of liftoff next week with the U.S. Air Force’s fifth X-37B spaceplane flight, a mission that will come with several firsts.