Spacewalkers Chris Cassidy and Tom Marshburn were able to finish replacing the oldest set of batteries on the International Space Station Friday, catching up on a task that was halted abruptly on Wednesday when the carbon dioxide level in Cassidy’s spacesuit started rising during the third extravehicular activity (EVA) of the STS-127 mission. As a result, planners rewrote the timeline for the fourth EVA to accommodate the work left undone. Originally Cassidy and astronaut Dave Wolf were ...

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