China's Tianzhou-3 cargo spacecraft ready for launch

China launches the Tianzhou-3 unmanned cargo spacecraft on a Long March 7 carrier rocket from the Wenchang Spacecraft Launch Site in south China's Hainan Province. The launch is part of the construction project of China's space station Tiangong, which is scheduled to complete in 2022. It will be the second cargo resupply mission to the already launched Tianhe core module. 

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