Video: Change of command aboard International Space Station

With three space station fliers heading home Sunday after a 168-day mission, three fresh crew members made final preparations for launch three days later to boost the lab’s crew back to six in a rapid-fire rotation that will prevent any major interruption of research activity.

A cache of cargo bound for the International Space Station lifted off on a commercial SpaceX launcher Friday, thundering into mostly clear skies over Florida’s Space Coast aboard a reused booster that made a bullseye landing back at Cape Canaveral accompanied by a crackling sonic boom.

Two cosmonauts and a NASA astronaut wrapping up a six-month stay aboard the International Space Station readied their Soyuz ferry ship for a fiery plunge back to Earth early Saturday amid preparations in Florida for launch of another station-bound crew Thursday aboard a SpaceX Crew Dragon spacecraft.