International Space Station

Endeavour's orbital manoeuvring system (OMS) pods and vertical stabiliser, photographed by a crew member Photograph: AP

Dave Williams of the Canadian Space Agency replaces a faulty control moment gyroscope. These are used to control the station's altitude in orbit Photograph: EPA

Astronauts Barbara R Morgan (l) and Tracy Caldwell inspect the apparent damage Photograph: AP

During a six-hour, 28-minute spacewalk, Williams works to remove the faulty gyroscope Photograph: EPA

Rick Mastracchio and Williams (out of frame), both STS-118 mission specialists, take part in what is the mission's first planned session of extravehicular activity Photograph: Getty

Mastracchio outside the vehicle as construction and maintenance continue Photograph: EPA

Attached to the Starboard 5 (S5) segment of the station's truss, Mastracchio carries out repairs Photograph: EPA