Spacewalkers replace failed computer outside space station

CAPE CANAVERAL Fla. (Reuters) - Two U.S. astronauts wrapped up a speedy spacewalk outside the International Space Station on Wednesday, replacing a failed computer that backs up one used to control critical systems such as the station's solar panel wings. Flight engineers Rick Mastracchio and Steve Swanson left the station's Quest airlock just after 10 a.m. EDT (1400 GMT) for what was expected to be a 2-1/2-hour spacewalk. They replaced the failed computer and got back into the space station

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