A pair of Russian cosmonauts embark on a six-hour space walk, floating more than 200 miles above the earth’s surface, to install new equipment and carry out maintenance tasks including window cleaning. Station commander Gennady Padalka and flight engineer Mikhail Kornienko left the station’s Pirs module at 1420 GMT, installing equipment to help crew members manoeuvre outside the ISS, before cleaning a porthole window to remove years of dirt left by exhaust fumes from visiting ships. The expedition is the 188th ISS spacewalk and the tenth for Padalka, who has spent more time in space than any other human