The international space station will be one piece closer to completion Saturday, after two spacewalking astronauts install a cube-shaped spacer onto the orbiting lab's frame. Meanwhile, back on Earth, NASA continued to review data on a worrisome gouge on the belly of the docked shuttle Endeavour. The damage, about 3 inches (7.6 centimeters) square, appears to have been caused by ice that broke off the fuel tank a minute after liftoff, though managers will not know for sure until they get more information. Wednesday's launch blasted teacher-turned-astronaut Barbara Morgan and her six crewmates into space for a two-week mission.
