NASA astronaut Christina Koch conducts her fourth spacewalk at the International Space Station. She and fellow NASA astronaut Jessica Meir (out of frame) ventured into the vacuum of space for seven hours and 17 minutes on Oct. 18, 2019, to swap a failed battery charge-discharge unit (BCDU) with a spare during the first all-woman spacewalk. The BCDU regulates the charge to the batteries that collect and distribute solar power to the orbiting laboratory’s systems.

Image Credit: NASA

美国宇航局宇航员克里斯蒂娜·科赫在国际空间站进行第四次太空行走。2019年10月18日,她和美国国家航空航天局宇航员杰西卡·梅尔(图外)在太空中进行了首次全女性太空行走,两人冒险进入真空空间7小时17分钟,用一个备用电池替换了一个出故障的电池充放电装置。BCDU对收集太阳能并将其分配给轨道实验室系统的电池进行充电。

图片来源:NASA

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