Video: Change of command aboard International Space Station

Bidding their crewmates farewell, a Russian cosmonaut and two NASA astronauts boarded their Soyuz ferry craft, undocked from the International Space Station and fell back to Earth Tuesday, landing safely on the snowy steppe of Kazakhstan to close out a 168-day mission.

Mission managers Tuesday granted approval to proceed with Wednesday’s rollout of the Atlas 5 rocket and Thursday’s launch to deliver the commercial Cygnus cargo ship into orbit to resupply the International Space Station.

Ready to double its Florida launch capacity with two pads, SpaceX is preparing to loft a reused robotic cargo ship toward the International Space Station Wednesday with a recycled Falcon 9 booster, debuting a rebuilt launch complex knocked offline more than a year ago in a fiery blast during pre-flight testing.