Astronauts Test Repair Goo in Spacewalk

This image provided by NASA shows the Special Purpose Dextrous Manipulator also known as Dextre in the grasp of the station's robotic Canadarm2 in this image photographed by a crewmember on the International Space Station Tuesday March 18, 2008 while Space Shuttle Endeavour is docked with the station. Also pictured are solar array panels. A blue and white Earth provides the backdrop for the scene. Two of the crew members will float outside Thursday night to squirt salmon-colored goo into the crevices of extra space shuttle thermal tiles that were deliberately damaged for the test. (AP Photo/NASA)