Expedition 61 astronauts Christina Koch and Jessica Meir replace a battery charge/discharge unit.
This will be the first all-female EVA in the history of human spaceflight.
Spacewalk begins at 11:50 a.m. UTC and is slated to last 6 ½ hours.
The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit. Its first component was launched into orbit in 1998, with the first long-term residents arriving in November 2000. It has been inhabited continuously since that date. The last pressurised module was fitted in 2011, and an experimental inflatable space habitat was added …