China's Shenzhou-21 and Shenzhou-23 astronaut crews held a handover ceremony on Thursday, during which the Shenzhou-21 crew transferred the keys of the country's space station to the latter. The Shenzhou-21 crew has now completed all planned tasks. The three astronauts will take

China's Shenzhou-21 and Shenzhou-23 astronaut crews held a handover ceremony on Thursday, during which the Shenzhou-21 crew transferred the keys of the country's space station to the latter. The Shenzhou-21 crew has now completed all planned tasks. The three astronauts will take

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