Live coverage: International crew lands in Kazakhstan

Relive the steps to stack the United Launch Alliance Atlas 5 rocket at Cape Canaveral’s Vertical Integration Facility for the Orbital ATK Cygnus cargo freighter for the space station. The first stage was erected initially, followed by the interstage and Centaur stage, then the encapsulated payload.

SpaceX’s Falcon 9 rocket and Crew Dragon spacecraft were lowered horizontal on pad 39A at NASA’s Kennedy Space Center the day before launch, allowing teams to address an issue with a chilled water loop near the top of the strongback structure.

Astronaut Scott Kelly, in good spirits and looking surprisingly fit after a record 340 days in space, said Wednesday he could have stayed up longer if necessary, giving him confidence future astronauts will be up to the challenge of even longer flights to Mars and beyond.