HOUSTON — International Space Station mission managers on Aug. 5 decided to wait until Saturday, Aug. 7 to begin a quickly devised dual-spacewalk strategy to repair the orbiting laboratory’s cooling system, which was crippled by a July 31 electrical short in an external pump module assembly. The first of the six-and-a-half to seven-hour spacewalks by Expedition 24 flight engineers Doug Wheelock and Tracy Caldwell Dyson of NASA is scheduled to get underway on Saturday at 6:55 a.m. EDT. ...

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