Taking a walk they will never forget, two Russian cosmonauts have been busy outside the International Space Station. <br /><br />It was the first ever spacewalk for flight engineers Alexander Skvortsov and Oleg Artemyev, who have been on the orbital outpost for almost three months. <br /><br />Among their tasks was hooking up a new communications antenna and moving a cargo boom.<br /><br />The ISS, a research laboratory owned by 15 nations, currently has a six strong, international crew.
