神舟二十一号乘组换乘顺利返回地球
China's Shenzhou-21 astronauts returned to Earth safely today, but they did not use their own spacecraft. Instead, the three crew members landed in the Shenzhou-22 return capsule in Inner Mongolia. Officials from the China Manned Space Agency said all are in good health.
The astronauts had spent six months on the Tiangong space station, carrying out experiments and spacewalks. They recently handed over duties to the newly arrived Shenzhou-22 crew. Before their return, engineers found a possible problem with the Shenzhou-21 capsule’s heat shield. To be safe, mission control decided to bring the crew home in the newer Shenzhou-22 spacecraft. This kind of swap is unusual but shows the careful planning behind human spaceflight.
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