宇航员在SpaceX出发回家前最后一次太空行走

2020年7月21日星期二,宇航员Bob Behnken 和 Chris Cassidy和在国际空间站外进行第四次，也是在返回前的最后一次太空行走。此次行走的目的并不是为了交换电池，而是要给电缆铺设路线，并挂上工具储存箱，以及进行其他维护。这也是他们职业生涯中的第10次太空行走，追平此前美国宇航员在空间站创造的行走纪录。在不到两周的时间里，Behnken和Doug Hurley将会乘坐于5月底抵达的同一艘SpaceX“龙”号载人飞船（Dragon capsule）离开这座环绕轨道的建筑群。SpaceX公司的目标是在8月份在佛罗里达州海岸附近进行一次溅落--这是45年来宇航员的第一次溅落。在天气允许的情况下，"龙 "太空舱将以跳伞形式进入佛罗里达州狭长带附近的墨西哥湾。

Bob Behnken and Chris Cassidy on a spacewalk outside of the International Space Station on Tuesday, July 21, 2020. The astronauts are on their fourth and final spacewalk in under a month and instead of swapping batteries, they'll be routing cables and hooking up a tool storage chest，and perform other maintenance. It was the 10th spacewalk in each of their careers, tying the U.S. record set by previous space station residents. In less than two weeks, Behnken and Doug Hurley, who monitored the spacewalk from inside, will depart the orbiting complex in the same SpaceX Dragon crew capsule in which they arrived at the end of May. SpaceX is aiming for a splashdown off the Florida coast in August — the first splashdown for astronauts in 45 years. Weather permitting, the Dragon capsule will parachute into the Gulf of Mexico off the Florida Panhandle.  source

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