Live coverage: Soyuz crew capsule departs station, lands in Kazakhstan

Two NASA astronauts and an Italian flight engineer are sheltering in the space station’s Russian segment as mission control analyzes a possible leak of toxic ammonia coolant aboard the complex.

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 Northrop Grumman Antares rocket stands on pad 0A at Wallops Island, Virginia, on a frigid morning hours before a planned liftoff with more than 8,000 pounds of cargo heading for the International Space Station.