KNTV NBC Nightly News With Lester Holt October 19, 2019 09:34:00
>> let me know when you're clear for me to start. >> reporter: traveling at 17,000 miles per hour, it was all business for astronauts jessica meir and christina koch, wearing the red tether replacing a failed power system on the space station. >> i have control of the battery. >> reporter: but today's milestone not lost on either woman. the first all-female space walk ever. >> we called ourselves space sisters because we were together really joined at the hip going through all the classes together. >> reporter: both women part of the astronaut class of 2013 this was koch's fourth space walk, t...
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