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China launched its first space station, Tiangong-1, in 2011. On Monday 2nd April, it landed in the Pacific Ocean after re-entering the Earth's atmosphere. China lost control of the vessel in 2016. Physics and Astronomy Professor Dan Reisenfeld from the University of Montana says such re-entries are common, and pose virtually no threat to humans. China hopes to launch its first manned space station in 2022. (Photo: Chinese cargo spacecraft Tianzhou-1 shortly before lift off at the Wenchang Space Launch Centre, 20 April 2017, Credit: Fred Dufour/AFP/Getty Images)