Photos: Atlas 5 rocket aims for International Space Station

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.

The crew spent 197 days docked at the ISS and welcomed seven visiting vehicles while on orbit. Splashdown off the coast of Florida is anticipated around 5:50 a.m. EDT on Tuesday, March 12.

Two days after launch from Kazakhstan, a Russian Soyuz ferry ship glided to a smooth docking with the International Space Station Saturday, bringing a veteran cosmonaut, a Frenchman making his first flight and NASA’s most experienced female astronaut to the lab complex.