央视揭秘太空应急20天：神二十返回舱玻璃裂纹呈三角形，初判为不足1毫米空间碎片撞击导致

Core Viewpoint - The article discusses the emergency response and actions taken by China's space program following the discovery of a crack in the Shenzhou 20 spacecraft's window, leading to a delay in its return and the initiation of an emergency launch of Shenzhou 22 to ensure the safety of the astronauts [1][11][42]. Group 1: Incident Discovery and Initial Response - On November 5, 2025, the Shenzhou 20 mission was abruptly paused due to the discovery of a crack in the spacecraft's window during a routine inspection [1][11]. - The crack was confirmed to be a through-crack, raising significant safety concerns for the spacecraft's re-entry [3][10]. - The decision to delay the return was made within 12 hours of confirming the crack, prioritizing safety above all [6][11]. Group 2: Safety Assessments and Emergency Protocols - A thorough safety assessment of the crack was conducted, including simulations and wind tunnel tests to understand potential changes during re-entry [13][14]. - The ground team worked tirelessly to determine the safest return plan for the astronauts, with a focus on minimizing risks [17][19]. - An emergency launch protocol was activated, with Shenzhou 21 already on standby to facilitate a safe return for the astronauts [19][42]. Group 3: Execution of Emergency Launch - On November 10, 2025, the decision was made for the Shenzhou 20 astronauts to return via Shenzhou 21, while simultaneously preparing for the emergency launch of Shenzhou 22 [42][71]. - The Shenzhou 22 mission was executed successfully, marking China's first emergency launch in its manned space program [71][76]. - The Shenzhou 21 spacecraft utilized a new three-orbit rapid return mode, reducing the return time by over three hours compared to traditional methods [48][49]. Group 4: Post-Incident Analysis and Future Implications - The incident highlighted the increasing threat of space debris, prompting a reassessment of spacecraft design and safety measures [78][80]. - The successful handling of the emergency situation has led to accelerated timelines for future spacecraft, with Shenzhou 23 and 24 expected to be completed ahead of schedule [80]. - The absence of a Shenzhou 22 astronaut crew in the sequence serves as a reminder of the ongoing challenges and the need for continuous improvement in safety standards within the space industry [80].