Two Earth-imaging satellites and an experimental solar sail payload rocketed into orbit Thursday aboard a Chinese Long March 4B launcher, the first flight for China’s Long March 4 rocket family since an upper stage failure in May.

SpaceX’s final planned Crew Dragon test flight before astronauts ride the commercial spaceship into orbit is scheduled for Saturday, when an unpiloted crew capsule will fire off the top of a Falcon 9 rocket shortly after launch from the Kennedy Space Center in Florida to test the craft’s in-flight emergency escape capability.

The development mission includes fewer additional mission milestones compared to the third flight with a focus on demonstrating the reusability model that Starship promises. Liftoff happened at 7:50 a.m. CDT (8:50 a.m. EDT, 1250 UTC), near the opening of a 120-minute window.