神舟二十一号发射进入“倒计时” 中国空间站将再迎“太空出差”新成员

Core Points - The Shenzhou-21 manned spacecraft launch mission has completed a comprehensive rehearsal, indicating that all systems are ready for the upcoming launch [1][3] - The rehearsal involved coordination among various centers, including the Jiuquan Satellite Launch Center and the Xi'an Satellite Measurement and Control Center, to simulate the launch process [1][3] - The rehearsal verified the reliability of the rocket, spacecraft, launch site, and measurement and control communication systems, ensuring they are in good condition for the mission [3][5] Group 1 - The rehearsal is described as a "full system + full process" test, confirming that system parameters and processes are locked in, marking the launch countdown phase [1][3] - The Shenzhou-21 spacecraft and Long March 2F Yao-21 rocket combination underwent functional and technical state verification during the rehearsal [5] - The rehearsal served as a comprehensive check-up for the spacecraft, confirming that all systems, including those of the astronauts, rocket, launch site, and measurement and control systems, are in good condition and ready for launch [5] Group 2 - The launch site has implemented targeted measures to address potential weather challenges such as low temperatures, seasonal winds, and dust storms [7] - The rocket and spacecraft are currently in a two-layer insulation system to maintain the desired temperature for propellants, with air conditioning in operation during nighttime [7] - Following the rehearsal, the next steps include fueling the rocket and preparing for the highly anticipated launch [7] Group 3 - The Chinese space station is preparing to enter the rendezvous and docking orbit, with the Shenzhou-20 astronaut crew having conducted manual docking practice in anticipation of the Shenzhou-21 spacecraft [9]