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WATCH: Space Station's 2 Women - Including Maine's Jessica Meir - Embark On 1st All-Female Spacewalk

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NASA
/
via Associated Press
In this photo released by NASA on Thursday, Oct. 17, 2019, U.S. astronauts Jessica Meir, left, and Christina Koch pose for a photo in the International Space Station.

CAPE CANAVERAL, Fla. — Men have floated out the hatch on all 420 spacewalks conducted over the past half-century. That changed Friday with spacewalk No. 421. NASA astronauts Christina Koch and Jessica Meir made "HERstory," as NASA is calling it, with the first all-female spacewalk. All four men aboard the International Space Station will remained inside, as Koch and Meir went out to replace a broken battery charger.

https://www.youtube.com/watch?v=21X5lGlDOfg

The battery charger failed after Koch and a male crewmate installed new batteries outside the space station last week. NASA put the remaining battery replacements on hold to fix the problem and moved up the women's planned spacewalk by three days.

NASA, meanwhile, asked schoolteachers to share photos of their students celebrating "HERstory in the making." 

Russia holds claim to the first spacewalk in 1965 and also the first spacewalk by a woman in 1984. The U.S. trailed by a few months in each instance.

As of Thursday, men dominated the spacewalking field, 213 to 14.

Meir, a marine biologist who arrived at the orbiting lab last month, was the 15th female spacewalker. Koch, an electrical engineer, already has done three spacewalks; she's seven months into an 11-month spaceflight that will be the longest by a woman.

NASA planned the first all-female spacewalk in March, but had to call it off because of a shortage of medium-size suits. Koch put together a second medium over the summer.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute's Department of Science Education. The AP is solely responsible for all content.

Updated Oct. 18. 2019 at 2:15 p.m. ET