NASA astronaut Jessica Meir waves at the camera during a spacewalk with fellow NASA astronaut Christina Koch (out of frame).
iss061e011841 (Oct. 18, 2019) — NASA astronaut Jessica Meir waves at the camera during a spacewalk with fellow NASA astronaut Christina Koch (out of frame). They ventured into the vacuum of space for seven hours and 17 minutes to swap a failed battery charge-discharge unit (BCDU) with a spare during the first all-woman spacewalk. The BCDU regulates the charge to the batteries that collect and distribute solar power to the orbiting lab’s systems.