Spacewalking astronauts stepped outside and gave the space station's new robot some eyes and a set of tools.It was the third spacewalk of shuttle Endeavour's visit to the station, each one aimed at putting together Dextre, the giant robot.The last time astronauts floated out, Dextre got arms. This time, the robot got two cameras that would serve as eyes. Also this time Dextre was equipped with three types of tools, four in all, as well as a platform for holding big items like batteries.

So far, the 12-foot (3.6-meter) robot and both of its 11-foot (3.3-meter) arms have checked out fine. Each arm has seven joints, and the crew wanted to make sure the brakes worked.Dextre, a Canadian Space Agency contribution that cost more than US$200 million, is designed to assist spacewalking astronauts and, eventually, to take over some of their chores. Its designers expect the robot one day replacing batteries and other space station parts, lifting as much as 1,300 pounds (590 kilograms), and also performing some fine precision tasks like handling bolts.It has a sense of touch and is capable of sensing force and movement. That's how Dextre got its name, in fact. It is short for dexterous (灵巧的). The space walkers had some robot-unrelated chores, such as attaching a science experiment to the European lab, Columbus, and unloading spare station parts from the shuttle and attaching them to the orbiting complex for future use.