Core Viewpoint - The Shenzhou 21 mission successfully completed several key tasks in a spacewalk, demonstrating effective collaboration between astronauts and ground support teams [2]. Group 1 - The Shenzhou 21 crew, consisting of astronauts Zhang Lu, Wu Fei, and Zhang Hongzhang, conducted an 8-hour extravehicular activity [2]. - Key tasks included inspecting and photographing the return capsule's porthole, installing a space debris protection device on the space station, and replacing the multi-layer cover of the temperature control adapter [2].

12月9日，经过约8小时的出舱活动，神舟二十一号乘组航天员圆满完成第一次出舱活动，顺利完成了神 舟二十号飞船返回舱舷窗巡检拍照、空间站空间碎片防护装置安装等任务。 0:00 第二是对舷窗玻璃周围的舱体进行确认，因为在返回过程中，返回舱的舱体状态是非常重要的，它的状 态正常与否决定了是否能够安全返回。最近这段时间，地面的团队和航天员一直是通过遥测来进行神舟 二十号飞船状态确认。目前从遥测参数看飞船状态是正常的，但是在遥测参数之外的物理状态就只能由 航天员从舱外来进一步确认，这样也是为后面神舟二十号飞船的进一步决策，做一些技术上的支持。虽 然不满足载人返回的条件，但是它的无人返回肯定要执行，所以要带一些东西回来，至于带什么东西就 要看最后的规划。 第二项内容就是天和核心舱的防护装置安装，之前几次出舱也都进行过这项工作，但由于这项工作体量 比较大，所以需要通过多次出舱来完成。这项工作的目的就是尽可能提高整个空间站应对空间碎片的能 力。 神舟二十一乘组完成了首次出舱活动，出舱任务进行了约8个小时，这次出舱的任务比较特殊，是之前 历次出舱都没有做过的任务，一共两件大事。 乘组出舱的首要任务是进行神舟二十号飞船舷窗玻璃以 ...

Core Points - The successful completion of the fourth extravehicular activity (EVA) by the Shenzhou 20 crew marks a significant achievement for China's space station program, showcasing the collaboration between astronauts and ground support teams [1][4][5] - This mission involved the installation of a space debris protection device, which is a critical component for the safety and longevity of the space station [6][7] - The Shenzhou 20 crew has now completed four EVAs, making them one of the most active astronaut teams in China's history [5][6] Summary by Sections Mission Overview - The EVA took place on September 26, 2023, with astronauts Chen Dong, Chen Zhongrui, and Wang Jie participating in the operation, which lasted approximately six hours [1][4] - This mission is notable as it is the first time two astronauts from the third batch have worked together on an EVA [5][6] Key Activities - During the EVA, astronauts Chen Zhongrui and Wang Jie successfully installed the space debris protection device and conducted inspections of external equipment [5][6] - The mission utilized a new mechanical arm adapter for the first time, which allowed for improved efficiency and safety during the operation [6] Future Plans - The Shenzhou 20 crew has been in orbit for over 150 days and is expected to continue conducting scientific experiments and technical tests [7] - The crew will celebrate the upcoming National Day and Mid-Autumn Festival in space, and they are preparing for the arrival of the Shenzhou 21 crew [7]

Core Points - The Shenzhou-20 astronaut team successfully completed their second extravehicular activity (EVA) lasting approximately 6.5 hours [1][9] - The installation of an automatic foot limit adapter and interface connector was a key task, which is expected to reduce future EVA times by about 40 minutes [5][7] - The team also installed a space debris protection device and conducted inspections of external equipment during the EVA [9][16] Group 1 - The Shenzhou-20 mission has been ongoing for over two months, focusing on various space science experiments [13] - The space debris issue has become increasingly prominent due to the rise in human space activities, posing risks to the space station [14][16] - The Chinese space station has improved its collision warning and avoidance processes to enhance its ability to prevent collisions [16][18] Group 2 - The Shenzhou-20 mission has completed a total of seven installations of space debris protection devices, providing reinforcement for critical components of the space station [16] - The research team has developed a monitoring and positioning system for potential leaks due to impacts, increasing the astronauts' response time to emergencies [18] - International cooperation has been established to share information and maintain the safety of spacecraft in orbit [18]