Astronauts are hard at work assembling a brand new segment to the International Space Station.
A spacewalk scheduled for almost 7 hours started a little after 5 o'clock this morning. Their mission is to outfit the European arm of the Space Station (called the Harmony node) in front of the U-S laboratory. The spacewalkers will hook up the electrical and fluid connections between the European and American laboratories. A major part of their mission is to move a 19-foot, 300-pound fluid tray to the Harmony node.