UARS could land anywhere between 57 degrees north and 57 degrees south of the equator — most of the populated world. Nasa says that most of the satellite will break or burn up before reaching Earth. But scientists have identified 26 separate pieces that could survive the fall through the atmosphere. This debris could rain across an area 400-500km (250-310 miles) wide. Robust, spherical satellite components such as fuel tanks are often most likely to survive the fiery plunge to Earth, say space experts. Upper Atmosphere Research Satellite The "productive scientific life" of UARS ended in 2005 when it ran out of fuel. Nasa said scientists would only be able to make more accurate predictions about where the satellite might land two hours before it enters the Earth's atmosphere."
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