Long-duration missions in space take a toll on the body, astronauts lose bone density and suffer muscle loss. Blood circulation is also affected, and fluid shifts can also impact eyesight.
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中国载人航天工程进入空间站应用与发展阶段以来，先后圆满完成6次载人飞行、4次货运补给、7次飞船返回任务，成功实施首次应急发射。，详情可参考91视频
Pakistan defence minister says country in 'open war' with Afghanistan after strikes