The risk that an individual will be hit and injured is estimated to be less than one in one trillion. To put this into context, the risk that an individual in the U.S. will be struck by lightning is about one in 1.4 million.
Reentry risk estimates are supported by the fact that, over the last 40 years, more than 1,400 metric tons of materials are believed to have survived reentry with no reported casualties (of course, it is possible that casualties have occurred somewhere in the world, but have not been reported). The largest object to reenter was the Russian Mir Space Station, which weighed 120,000 kg.
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