The Endeavour astronauts completed a final damage survey of the heat shielding on the orbiter’s wings and nose cap early May 26, setting the stage for the fourth mission spacewalk outside the International Space Station (ISS). The three-hour inspection, using the camera and laser-tipped Orbiter Boom Sensor System (OBSS) while in the grip of Endeavour’s robot arm, produced no obvious signs of debris impact damage that would preclude the spacecraft’s June 1 return to Earth. The ...


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