Live coverage: International crew lands in Kazakhstan

SpaceX’s next Falcon 9 rocket rolled out of its hangar and up the ramp to launch pad 39A Sunday in preparation for liftoff on a two-day trek ferrying more than 6,400 pounds of supplies and experiments to the International Space Station.

Boeing’s Starliner crew capsule could take off in October on its first unpiloted test flight to the International Space Station, a company official said recently, while SpaceX finishes up the investigation into the explosion of its Crew Dragon spacecraft during a ground test earlier this year.

Helium leaks and thruster issues prompted NASA to extend their stay aboard the space station indefinitely — Wednesday marked their 35th day in orbit — while engineers carry out tests and analysis to better understand what caused the problems and to make sure the spacecraft can safely being Wilmore and Williams home.