HOUSTON—Working more than an hour ahead of schedule at times, NASA astronauts Christina Koch and Drew Morgan on Oct. 6 successfully initiated a month-long spacewalk campaign to replace a dozen aging nickel hydrogen (NH) power storage batteries with six more-efficient lithium ion (Li) units on the far port side of the International Space Station’s nearly 360-ft.-long solar power truss. As the seven-hour excursion came to an end at 2:40 p.m. EDT, Koch and Morgan had removed three ...

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