This screen image captured at Beijing Aerospace Control Center on April 15, 2023 shows Shenzhou-15 taikonaut Zhang Lu performing extravehicular activities outside the Wentian lab module. The Shenzhou-15 taikonauts on board the orbiting Chinese Tiangong space station have completed their fourth spacewalk, the China Manned Space Agency said on Sunday. (Xinhua/Guo Zhongzheng)