Live coverage: Space station crew concludes 186 days in orbit

Flight controllers at NASA’s mission control center in Houston have completed the robotic swap out of a failed power distribution unit outside the International Space Station, clearing a hurdle ahead of Friday’s predawn launch from Cape Canaveral of a SpaceX supply ship.

A Soyuz rocket with a three-person crew heading for the International Space Station lifted off at 1357 GMT (9:57 a.m. EDT) Wednesday in the final launch currently scheduled from Gagarin’s Start, a historic site at the Baikonur Cosmodrome in Kazakhstan from where Yuri Gagarin departed on the first human spaceflight in 1961. Beginning next year, Soyuz crews will blast off from a different pad at Baikonur.

One of the final pieces for the first test flight of NASA’s huge Space Launch System heavy-lift rocket recently arrived at the Kennedy Space Center, joining other elements already at the Florida spaceport awaiting shipment of the SLS core stage once it completes testing at a NASA facility in Mississippi.