中国航天员首次“换乘”天外平安归来

Core Points - The Shenzhou 20 astronaut crew successfully returned to Earth aboard the Shenzhou 21 spacecraft, setting a new record for the duration of stay in orbit for Chinese astronauts [1][2] - This marks the first time Chinese astronauts have returned safely from space using a "transfer" method between spacecraft [2] - The Shenzhou 20 crew spent a total of 204 days in space, completing four extravehicular activities and numerous scientific experiments across various fields [3] Summary by Sections - Return Mission: The Shenzhou 20 crew was initially scheduled to return on November 5 but faced a delay due to a minor crack in the spacecraft's window. The mission was resumed with the crew transferring to the Shenzhou 21 for their return [2] - Safety Measures: The Chinese manned space program prioritized safety, activating emergency protocols and ensuring a coordinated response to the situation [2] - Crew Achievements: Commander Chen Dong became the first Chinese astronaut to exceed 400 days in total spaceflight duration and holds the record for the most extravehicular activities [2][3] - Scientific Contributions: During their 204 days in orbit, the crew conducted extensive scientific experiments in microgravity, materials science, life sciences, and aerospace medicine, in collaboration with ground researchers [3]