However, after consulting with McClain and Hague following the first spacewalk, mission managers made a decision to adjust the assignments, due in part to spacesuit availability on the station.
Astronauts Anne McClain and Christina Koch were supposed to make the historic spacewalk on Friday, when they were to install lithium-ion batteries to one pair of the station's solar arrays.
Koch will become the 14th woman to perform a spacewalk on Friday, according to the agency.
The spacesuits are not as a simple task as what we think.
Despite the lack of female presence in space, The New York Times reports that astronauts Nick Hague and Christina Koch will be assisted by a team at mission control led by women, "including the spacewalk's flight director, Mary Lawrence, and its lead officer, Jackie Kagey".
So it was only in space - and with McClain's spacewalk last week - that NASA discovered McClain and Koch both require a size medium spacesuit, and only one is ready to wear on station.
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She will wear the medium-size suit used by McClain on a spacewalk with Hague last week. Spacewalks are strenuous as it is; if an astronaut truly feels their suit isn't the right fit, it does seem better to err on the side of caution than encourage them to go ahead regardless.
That's also the size suit that fits Koch best - but only one is available for Friday's seven-hour spacewalk.
Two mediums existed on the ISS, but only one was prepped for a spacewalk.
/Public Release. For more details, please visit NASA website.
The availability of enough spacesuit sizes has always been a bit of a sensitive subject for NASA. The mission is "tentatively scheduled" to take place on April 8th. U.S. EVA-53 on March 29 is planned to be the 215th performed at the ISS since 1998. "Chances are they're going to see space again at some point and, as much as we can, we'd like to make them veteran spacewalkers". She holds a Bachelor's Degree in electrical engineering and physics and a Master's Degree in electrical engineering. Just four years after the record-breaking class of 50 percent women, five of the 11 members of the 2017 astronaut candidate class still in training are women as well. "With the increase in the percentage of women who have become astronauts, compared to men, it is inevitable that women will continue to break new ground".