This was supposed to be a history-making week for NASA, with the first all-female spacewalk originally planned to take place on Friday. Unfortunately, a last-second swap has led to one of the expected participants, Anne McClain, being replaced with fellow ISS inhabitant Nick Hague.

NASA’s explanation was that McClain wouldn’t have a space suit available to her for the spacewalk due to sizing, since Christina Koch will be wearing the medium-sized suit that McClain wore during her previous spacewalk last week. This left a lot of people scratching their heads. After all, NASA says there’s two of every size of space suit on board the ISS, so why can’t both McClain and Koch wear the same sized suits? Speaking with CNN, NASA representatives

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