Three astronauts who had been stranded at China's space station are heading home on the craft that brought up their replacements. The trio had been on the station for six months and were supposed to return Nov. 5, four days after the new crew arrived. Their return was aborted because their Shenzhou-20 spacecraft had minor cracks in a window, apparently from space debris. China's space agency said they were returning Friday on the Shenzhou-21 craft instead. The astronauts traveled to the Tiangong space station in April.
