Astronauts Gear Up for 4th Spacewalk

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In this image from NASA TV. Dextre the two-armed Special Purpose Dexterous Manipulator is seen on the International Space Station Wednesday March 19 2008. The Canadian robotic arm will be used for external space station maintenance. (AP PhotoNASA TV ...
In this image from NASA TV. Dextre, the two-armed Special Purpose Dexterous Manipulator, is seen on the International Space Station, Wednesday, March 19, 2008. The Canadian robotic arm will be used for external space station maintenance. (AP Photo/NASA TV)

(AP) -- The astronauts on the orbiting shuttle-station complex geared up Thursday for the fourth spacewalk of their mission, a high-profile test of a repair technique they hope they never have to use.


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