Video: Change of command aboard International Space Station

A Russian Soyuz booster rolled out of a hangar at the historic Baikonur Cosmodrome and rode a rail car to its launch pad Monday, setting up for Wednesday’s launch with a three-man crew hailing from Russia, Denmark and Kazakhstan.

Eric Boe, one of three astronauts assigned to the first piloted test flight of a Boeing CST-100 Starliner commercial crew ship later this year has been removed from the mission due to unspecified medical issues, NASA announced Tuesday. He will be replaced by veteran astronaut Mike Fincke.

A Northrop Grumman Cygnus supply ship — named the S.S. Katherine Johnson for the trailblazing NASA mathematician portrayed in “Hidden Figures” — was loaded with time-sensitive cargo Friday at a launch pad in Virginia for a midday blastoff Saturday toward the International Space Station.