It seems like a plot straight out of a thriller space movie, but one that may not have a happy ending. A rogue Chinese space station is slowly spiralling down to earth, where it may cause a lot of mayhem on impact. How bad is this development? Well, the Tiangong-1 Chinese space station is carrying a highly toxic, cancer-causing chemical onboard, and experts watching its downward spiral don't yet know where it will hit the earth. Aerospace agencies from around the world are monitoring the doomed Chinese space craft's descent, which has been travelling out of control since September 2017. The European Space Agency predicts its atmospheric re-entry window between March 17 and April 21. Tiangong-1 will burn as a bright fireball as it re-enters Earth's atmosphere, still 10 to 40 per cent of the satellite is expected to survive the crash.