Core Points - The Shenzhou-20 manned spacecraft is scheduled for launch on April 24 at 17:17, marking a significant milestone in China's manned spaceflight program [1] - China has successfully conducted 20 extravehicular activities (EVAs) to date, demonstrating a transition from technical validation and simple operations to complex task execution [3][5] Summary by Categories Technical Validation - The EVAs have validated key technologies such as spacesuits, airlocks, robotic arms, and ground support systems [3] - The longest single EVA duration has reached 9 hours, setting a world record [5] Assembly and Maintenance - Extravehicular assembly tasks have included the installation of external pump groups, payload exposure platforms, and cross-module cable connections, achieving the complete design functionality of the space station [3] - The first EVA maintenance was conducted to repair damage to the solar wing cables caused by space debris, restoring power generation capabilities [3] Active Protection - To ensure the long-term safety of the space station, proactive measures against space debris have been implemented, including inspections and the installation of debris protection devices [3][5] Overall Capability - China's EVA technology has matured, reaching an internationally advanced level, with the spacesuits performing well beyond their design specifications [5] - The collaboration between ground and space support systems has improved, providing effective professional support for EVA planning, process control, and emergency response [5]

Core Viewpoint - The Shenzhou-20 manned mission is set to launch on April 24, 2023, at 17:17 Beijing time, with a crew of three astronauts, including Chen Dong as the commander, marking significant progress in China's manned spaceflight capabilities [1][2]. Group 1: Manned Spaceflight Progress - The Shenzhou-20 crew consists of two pilots and one flight engineer, with Chen Dong becoming the first astronaut from the second batch to fly three times, while Chen Zhongrui and Wang Jie are set for their first flights [2]. - China has successfully conducted 20 extravehicular activities (EVA), demonstrating advanced technology and capabilities in this area, reaching an international advanced level [2]. Group 2: Lunar Mission Developments - The development of China's manned lunar mission is progressing smoothly, with the Long March 10 and Dream Chaser spacecraft undergoing initial testing as planned [2]. - Major tests for the lunar mission, including the Long March 10 electrical system matching test and the Dream Chaser's first high-altitude drop test, have been completed [2]. Group 3: Extravehicular Activity Achievements - Key technologies verified during EVAs include spacesuits, airlock operations, robotic arm assistance, and ground support for extravehicular activities [3]. - Successful assembly tasks were completed outside the space station, including the installation of external pump groups and support rods, achieving the complete design functionality of the space station [3]. - The first extravehicular maintenance was conducted to repair damage to the solar wing cables caused by space debris, restoring power generation capabilities [3]. - Proactive measures for space debris protection have been implemented, enhancing the space station's ability to respond to debris threats through multiple inspections and installations of protective devices [3].