It could fall on a number of cities.
There's a 21-ton out-of-control rocket falling back to Earth — and no one is quite sure where it's going to land.
According to experts, the uncontrolled re-entry could happen above any one of a number of population centers across the world.
On Thursday, China announced the successful launch of the Tianhe module of the new space station it is building; and it was successful, in that the module made it to space.
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