A Japanese and an American astronaut floated outside the International Space Station today on a spacewalk to repair the orbiting outposts robotic arm and move some equipment into storage. <br/><br/>The spacewalk is the first for Japanese Aerospace Agency (JAXA) astronaut Norishige Kanai, and the fourth for his US counterpart Mark Vande Hei. <br/><br/>The outing began when the duo switched their spacesuits to battery power before venturing out into the vacuum of space. It is expected to last six and a half hours.<br/><br/>