China’s 9-ton Tiangong-1 space station will burn up tonight, but no one knows quite where

What goes up must come down. That's generally the rule, anyway, certainly for spacecraft that have fulfilled their purpose and have no way to stay in orbit. Such is the case of Tiangong-1, China's first space station, which after nearly 7 years in space is making an uncontrolled descent and should provide a nice fiery light show in the skies over... somewhere.