NASA astronaut Christina Koch conducts a spacewalk

iss061e001727 (Oct. 6, 2019) --- NASA astronaut Christina Koch (right) conducts a spacewalk at the Port-6 (P6) truss structure work site to upgrade International Space Station power systems. She and fellow NASA astronaut Andrew Morgan (left) worked outside in the vacuum of space for seven hours and one minute to begin the latest round of upgrading the station's large nickel-hydrogen batteries with newer, more powerful lithium-ion batteries.