Astronauts assist spacewalkers in the Quest airlock

NASA astronauts Andrew Morgan (left) and Christina Koch (right) are suited up in U.S. spacesuits before beginning a seven hour and one minute spacewalk to upgrade the station's large nickel-hydrogen batteries with newer, more powerful lithium-ion batteries. In the center, NASA Flight Engineer Jessica Meir and Commander Luca Parmitano of ESA assist the spacewalking duo.