关于这张图
iss061e005514 (Oct. 11, 2019) --- With the Earth 250 miles below him, NASA astronaut Andrew Morgan works on the Port 6 truss segment of the International Space Station to replace older hydrogen-nickel batteries with newer, more powerful lithium-ion batteries. Fellow NASA astronaut Christina Koch (out of frame) assisted Morgan during the six-hour and 45-minute spacewalk.
