神二十飞船返回前 航天员做了哪些准备工作？

Core Points - The Shenzhou-20 spacecraft successfully landed at the Dongfeng landing site on January 19, 2026, marking a significant achievement in China's space exploration efforts [1] - The Shenzhou-21 crew, consisting of astronauts Zhang Lu, Wu Fei, and Zhang Hongzhang, undertook various preparatory tasks before the return of the Shenzhou-20 spacecraft [1] Group 1: Preparatory Work - The astronauts organized and packed downlink items and waste, including retired extravehicular spacesuits and several large payloads from space application systems [1] - The downlink items and waste were loaded onto the spacecraft, with the amount of downlink materials reaching a historical high. The astronauts ensured proper mass balancing during the transfer and fixation of materials to maintain the spacecraft's stability during return [1] Group 2: Technical Checks - The crew conducted a detailed inspection of the docking passage and hatch status, confirming that the hatch sealing performance was good [3] Group 3: Departure from Space Station - On January 19, the spacecraft successfully detached from the space station assembly and began its journey back to Earth [4]