Video: Change of command aboard International Space Station

Ready for a flight to the International Space Station, SpaceX’s first upgraded Dragon cargo capsule rolled out to pad 39A at NASA’s Kennedy Space Center in Florida this week in preparation for launch on top of a Falcon 9 rocket.

Two spacewalkers attached a new docking port to the International Space Station Friday, clearing the way for U.S. crew ferry ships being built by Boeing and SpaceX to begin test flights to the lab complex next year.

NASA expects to select commercial contractors to resupply the International Space Station in September, three months later than the agency’s previous timetable under a competition for cargo deliveries beginning in 2018.