An out-of-control Chinese space station will soon fall to Earth

ITS name means "heavenly palace". But Tiangong-1, an eight-tonne Chinese space station launched in 2011, will not remain in the heavens much longer. After visits from crews in 2012 and 2013, Tiangong-1's mission officially ended in March 2016. A few months later China's space agency appeared to confirm what amateur skywatchers had already suspected, that it had lost control of the station. It said it expected Tiangong-1 to fall from the sky sometime late in 2017. In fact, the station is still up...