China’s three-man Shenzhou-21 (SZ-21) crew returned to Earth today after 210 days aboard the Tiangong space station. They landed not in the SZ-21 spacecraft, however, but SZ-22. SZ-22 was launched with no one aboard because the SZ-20 spacecraft was damaged by space debris and unsafe to bring the SZ-20 crew home. They had to use SZ-21’s spacecraft. China keeps a rocket and spacecraft ready at the launch site for emergencies like this, enabling them to quickly launch SZ-22 to serve as SZ-21’s safe haven and ride home. The SZ-23 crew is now aboard Tiangong continuing the crew handovers that began at the end of 2022.
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