NASA: First ever all-female spacewalk postponed

NASA astronaut Christina Koch (center) assists fellow astronauts Nick Hague (left) and Anne McClain in their U.S. spacesuits shortly before they begin the first spacewalk of their careers. (Credits: NASA)

Friday could have been a historic moment in space, but now NASA's first all-women spacewalk has been postponed due to spacesuit issues.

NASA astronaut Anne McClain was supposed to be joined by Christina Koch, but in a statement from NASA, the agency says they don't have the right spacesuit sizes available. 

Both women reportedly wear the same size top, but only one will be ready by the end of the week. 

Koch will now complete the mission with astronaut Nick Hague instead. 

This will be Koch's first ever spacewalk.