<p><br /> Discovery's astronauts have taken one final spacewalk outside the International Space Station before the shuttle goes into retirement.<br /> </p><p><br /> Spacewalkers Alvin Drew and Stephen Bowen have been doing relatively minor jobs that will leave the orbiting lab in the best possible condition, once the space shuttles stops flying.<br /> </p><p><br /> Drew and his colleague Stephen Bowen whittled down the entire to-do list, including installing a rail car light and an outdoor robot's camera.<br /> </p><p><br /> Discovery will remain at the space station until Sunday.<br /> </p><p><br /> The shuttle astronauts are staying an extra day to help fit the new storage room.<br /> </p><p><br /> There is a possibility that yet another bonus day might be added, which would stretch the mission to 13 days.<br /> </p>
