Watch the Falcon 9 launch from pad 39A

Nine Merlin main engines at the base of a SpaceX Falcon 9 rocket fired at launch pad 39A Saturday, passing a major test before the company’s next launch, a secretive mission slated for liftoff Wednesday night.

Japan’s space agency has set Sept. 30 as the target launch date for the country’s sixth resupply mission to the International Space Station, carrying cargo, experiments and six lithium-ion batteries to kick off a major upgrade of the lab’s electrical system.

A Japanese communications satellite rode a Falcon 9 rocket into space from Cape Canaveral early Friday, reaching an on-target orbit as the launcher’s first stage booster nailed a high-speed landing on a platform in the Atlantic Ocean, logging another achievement for SpaceX’s cost-cutting reuse initiative.