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]