Video: Change of command aboard International Space Station

Ax-4 will mark the first time an astronaut from India or Poland visits the International Space Station. The mission will be commanded by former NASA astronaut Peggy Whitson, making her second trip to the ISS on behalf of Axiom Space.

A Northrop Grumman Cygnus supply ship rocketed into orbit from Virginia Friday night on an Antares launcher, taking aim on the International Space Station with an advanced $23 million zero-gravity titanium toilet and several tons of other gear.

SpaceX is targeting launches March 6 and March 11 for its next two missions after swapping an upper stage for its next Falcon 9 rocket with another stage already being readied for liftoff at Cape Canaveral.