NASA astronauts Christina Koch and Jessica Meir, the first all-female duo to conduct a spacewalk, trekked successfully through a seven-hour excursion outside the International Space Station (ISS) on Oct. 18 to replace a faulty power control unit essential to the operation of the six-person orbiting science lab’s avionics. The difficulty with the Battery Charge/Discharge Unit (BCDU) was detected a day after the second of five planned spacewalks at the far port side of the ...

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