天地接力二十天

Core Viewpoint - The successful emergency launch of the Shenzhou spacecraft highlights China's commitment to astronaut safety and rapid response capabilities in the face of unexpected challenges [1][2][3]. Group 1: Incident Overview - A crack was discovered on the Shenzhou 20 spacecraft's window, prompting immediate assessment and decision-making by the China Manned Space Engineering Office [1][2]. - The crack was determined to be a through-crack, compromising the safety of the spacecraft during re-entry [2][3]. - Experts quickly convened to evaluate the implications of the crack on the spacecraft's structural integrity and astronaut safety [2][3]. Group 2: Response Actions - A series of simulations and tests were initiated to replicate the impact that caused the crack, leading to the decision to postpone the Shenzhou 20 return mission [3]. - The Shenzhou team adopted a parallel working model to expedite the analysis and ensure thorough validation of safety measures [3][4]. - The decision was made to have the Shenzhou 20 crew return on the Shenzhou 21 spacecraft, with the Shenzhou 22 launch scheduled shortly after [4][5]. Group 3: Technical Adjustments - The return method for the Shenzhou 21 was modified from a five-orbit to a three-orbit rapid return, marking a significant technical advancement [5][6]. - The GNC (Guidance, Navigation, and Control) system was crucial for the successful implementation of the new return strategy [6][7]. - The team worked tirelessly to ensure that all systems were ready for the emergency launch, maintaining high standards despite the compressed timeline [10][12]. Group 4: Launch Success - The Shenzhou 22 spacecraft was successfully launched on November 25, 2025, completing the emergency mission [13]. - The event served as a reminder of the importance of rigorous preparation and the need for continuous improvement in safety protocols [13][14]. - The successful return of the Shenzhou 20 crew underscored the resilience and dedication of the Chinese space program [7][14].