Visitors stand beside a model of the Tiangong-1 space lab in 2010, at the 8th China International Aviation and Aerospace Exhibition in Zhuhai, China. The real Tiangong-1 was launched into space in 2011 and will be returning to Earth next year — with some observers speculating China has lost control over the spacecraft. Kin Cheung/AP hide caption

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Kin Cheung/AP