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 ...

记者：心里会不会揪一下？ 飞船舷窗突现裂纹，中国航天进入应急发射模式！如何克服重重困难，高效应对突发事件？从预案到实战，中国航天第一次应急发射经历了怎样的20天？ 专访航天五大系统总师，20天高效应对突发情况，一起了解这背后的故事。 2025年11月5日，神舟二十号返回任务被按下紧急暂停键。在计划返回前一天对飞船返回舱的例行检查中，神舟二十号航天员乘组发现舷窗的边缘有一个 局部的异常现象。中国航天科技集团五院载人飞船系统总设计师贾世锦在航天员报告这一突发情况后的第一时间收到了现场照片。 中国航天科技集团 贾世锦：有一个三角形的痕迹。尺寸并不是很大，我们第一眼看到下行的照片之后，感觉不太好判断它是一种什么东西，像是被一种 漆什么的粘在上面似的。 按照指令，神舟二十号航天员在不同的角度，不同的光线情况下对异常位置进行拍照，同时利用空间站机械臂上的摄像机从舱外对舷窗进行辅助拍照。照 片传回地面，地面组织了国内十多个玻璃相关行业的专家对损伤情况进行研判。 中国航天科技集团 贾世锦：首先这个地方是不是裂纹，第二个这个裂纹，是不是贯穿性的裂纹，还是只是表面的裂纹？都要把它说得清楚才行，不能笼 统地说可能是裂纹。大家最终统 ...

Core Insights - The Shenzhou-20 mission was temporarily halted due to a crack found in the spacecraft's window, leading to an emergency response that culminated in the successful return of the Shenzhou-22 spacecraft, which carried supplies and a device to address the crack issue [1][2]. Group 1: Mission Response - The Shenzhou-22 spacecraft was launched with a device to handle the crack in the Shenzhou-20 window, demonstrating a proactive approach to mission challenges [1][2]. - The Shenzhou-20 will return to Earth unmanned, providing valuable data for future missions [2]. Group 2: Space Debris Concerns - The increase in space debris poses significant threats to operational spacecraft and astronauts, necessitating enhanced protective measures within China's space program [6]. - The crack in the Shenzhou-20 window was preliminarily attributed to a piece of space debris less than 1 millimeter in size, highlighting the dangers posed by high-speed debris [5]. Group 3: Future Developments - The Shenzhou-23 spacecraft's production has been accelerated, with completion expected two months earlier than originally planned, while the Shenzhou-24 is targeted for summer production [7]. - The absence of a crew for the Shenzhou-22 mission serves as a reminder for continuous improvement and vigilance in the space program, emphasizing that achieving perfection is an ongoing pursuit [9].

Core Viewpoint - The article commemorates the life and contributions of Du Heng, a pioneer in China's space environment and space debris protection field, who passed away on November 24, 2025, at the age of 90 [1][3]. Group 1: Personal Background - Du Heng was born in March 1935 in Shanghai and enrolled in Peking University in 1954, majoring in geophysics, later transitioning to space physics [3]. - He graduated with a master's degree in 1965 and worked at the Chinese Academy of Sciences National Space Science Center from 1965 to 1995, focusing on space physics and environmental research [3]. Group 2: Contributions to Space Research - Du Heng was a key founder of China's space environment research, leading over ten national projects, including the "863" program [3][4]. - He played a significant role during the "Two Bombs, One Satellite" project, conducting research on high-altitude nuclear explosions and missile-related physics, laying a foundation for national defense technology [3]. - In 1966, he led radiation protection research for the "Dongfanghong-1" satellite, making it one of the first satellites globally to consider radiation protection [3]. - He was responsible for the first top-level design report on space environment in China, completed in 1989, and led the development of several balloon satellites and the "Shijian-4" satellite [3][4]. Group 3: Space Debris Research - Du Heng was a foundational figure in China's space debris research, initiating it as a specialized research direction in 1987 during the "863" program [4]. - In 2000, he became the first head of the National Defense Science and Technology Commission's Space Debris Action Plan Expert Group, establishing a systematic and forward-looking framework for space debris research [4]. - His proposed three major engineering development goals for space debris in 2005 became a milestone core program, providing a clear direction for the long-term development of this field in China [4]. Group 4: Legacy and Recognition - Du Heng was recognized for his loyalty to the country and the Party, innovative spirit, and dedication to advancing China's aerospace industry [4]. - His contributions were significant in the development of China's first artificial Earth satellite and manned spaceflight missions [4].

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]