NASA astronaut Anne McClain works on the International Space Station's Port-4 truss structure during a six-hour, 39-minute spacewalk to upgrade the orbital complex's power storage capacity.
iss059e002207 (March 22, 2109) — NASA astronaut Anne McClain works on the International Space Station’s Port-4 truss structure during a six-hour, 39-minute spacewalk to upgrade the orbital complex’s power storage capacity.