The Chinese rocket that will fall back to Earth in a few days is equivalent in size to two semi-truck trailers, and as much as 40 percent of this metal will reach the Earth's surface, experts say.Although the overall risk of harm to people is low-there is only a 0.5 percent chance of injury or death to a human, based on one model-these risks are nonetheless higher than accepted by most spacefaring nations, said Ted Muelhaupt, a reentry and debris expert at The Aerospace Corporation.
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