Photos: Tuesday’s Atlas 5 rollout

A United Launch Alliance Atlas 5 rocket will boost NASA’s Tracking and Data Relay Satellite-M, or TDRS-M, into space from Cape Canaveral on Aug. 18 at 8:03 a.m. EDT (1203 GMT).

The Russian Soyuz MS-02 spacecraft and booster rocket were rolled out to the launch pad at the Baikonur Cosmodrome on Sunday in preparation for liftoff Wednesday on a two-day trek to the International Space Station.

Christopher Ferguson, commander of the final space shuttle flight and now a Boeing executive, has stepped down as commander of the first piloted test flight of the company’s troubled CST-100 Starliner commercial spacecraft, he and Boeing announced Wednesday. He has been replaced by NASA astronaut Barry “Butch” Wilmore.