Three more Chinese astronauts, or taikonauts, are now marooned in space following the successful return of their previously stranded comrades. The latest development highlights a potential flaw in China's space protocols, experts say, which could put astronauts needlessly at risk.
The latest stranded trio — Zhang Lu, Wu Fei and Zhang Hongzhang — are the crew of the Shenzhou-21 mission. They have been living onboard China's Tiangong space station since Oct. 31, shortly after they were launched into space by a Long March 2F rocket. Their mission was to take over from the station's incumbent Shenzhou-20 crew, made up of taikonauts Wang Jie, Chen Zhongrui and Chen Dong, who were originally due to return to Earth on Nov. 5.
However, after a successful handover period, the Shenzhou-20 crew's return trip was called off at the last minute when a piece of suspected space junk hit their return capsule. After tests revealed a crack in the viewing port of the struck spacecraft, the Shenzhou-20 crew boarded the return capsule designated for the Shenzhou-21 crew and successfully returned to Earth on Friday (Nov. 14).
But while many were quick to celebrate the return of the Shenzhou-20 crew, who completed the longest single spaceflight by any taikonauts (204 days), this now means that the Shenzhou-21 crew has no way of returning to Earth themselves, Live Science's sister site Space.com reported.
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