The European Space Agency said: "One of the main reasons why it is so hard to make accurate reentry predictions, even if just a few days in advance of an expected reentry, materialised during Thursday this week".
Tiangong-1 re-entered Earth's atmosphere at 8:16 p.m.
According to the Aerospace Corporation, the odds of someone getting hit by a falling space object like this one is less than 1 in 1 trillion, and debris from the spacecraft will most likely fall into the ocean.
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"Most likely the debris is in the ocean, and even if people stumbled over it, it would just look like rubbish in the ocean and be spread over a huge area of thousands of square kilometers". But even the latest predictions could end up being off due to unusual behavior by the atmosphere, Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics, said on Twitter.
Tiangong-1 had not been occupied for three years, so there is no way of knowing for certain where it will land.
Tiangong-1, which translates to "Heavenly Palace 1", was sent into orbit in 2011 for experiments as part of China's space programme.
The chances of Tiangong-1's re-entry are slightly higher in New Zealand, Tasmania, the northern states of the USA, northern China, the Middle East, central Italy, northern Spain, and parts of South America and southern Africa.
The space station was set to have a controlled re-entry into the Earth's atmosphere, but the lab stopped working in March 2016.
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If Tiangong-1 does reenter near you, chances are you will be able to see debris burning up in the sky, much like a small series of white meteors. Its last crew departed in 2013 and contact with it was cut in 2016.
During the re-entry, atmospheric drag will rip away solar arrays, antennas and other external components at an altitude of around 60 miles, according to the Chinese space office.
The station is gradually coming close to Earth.
China has lost communication with the module and there is no way to control its downward flight.
Thirteen space agencies, under the leadership of the European Space Agency, have been using radar and optical observations to follow its path around the globe, modelling its behaviour.
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