NASA Spacewalks

IN SPACE - OCTOBER 7: In this handout from National Aeronautics and Space Administration or NASA, European Space Agency (EPA) astronaut Alexander Gerst, Expedition 41 flight engineer, uses a camera to make a photo of his helmet visor during a session of extravehicular activity (EVA) outside the International Space Station (ISS) October 7, 2017 in space. During the six-hour, 13-minute spacewalk, Gerst and NASA astronaut Reid Wiseman, flight engineer, worked outside the Quest airlock to relocate a failed cooling pump to external stowage and installed gear that provides back up power to external robotics equipment. (Photo by NASA via Getty Images)