关于这张图
iss061e003491 (10/6/2019) --- A view of extravehicular crewmember 1 (EV1) Christina Koch on the Exposed Pallet (EP) during Extravehicular Activity 56 (EVA 56) cleanup operations (OPS). The Earth limb is in the background. Extravehicular activity (EVA) is any activity done by an astronaut or cosmonaut outside a spacecraft beyond the Earth's appreciable atmosphere. The term most commonly applies to a spacewalk made outside a craft orbiting Earth (such as the International Space Station).
