Astronauts Gear Up for 4th Spacewalk

By MARCIA DUNN, AP Aerospace Writer, Space & Earth science / Space Exploration

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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