The six-tonnes NASA science satellite fell back to Earth

NASA undated handout image of the Upper Atmosphere Research Satellite (UARS) which was launched on September 15, 1991, by the space shuttle Discovery. The six-tonnes NASA science satellite fell back to Earth, the U.S. space agency said on Saturday, but it was not yet known where the remains landed. NASA said its decommissioned Upper Atmosphere Research Satellite was "passing over Canada and Africa as well as vast portions of the Pacific, Atlantic and Indian oceans" as it returned to Earth, and that "the precise re-entry time and location are not yet known with certainty." The 20-year-old satellite, which took an unpredictable course as it tumbled through the upper atmosphere, fell to Earth sometime between 11:23 p.m EDT on Friday and 1:09 a.m. EDT on Saturday (0323 to 0509 GMT on Saturday), NASA said. There were reports on Twitter of debris falling over Okotoks, a town south of Calgary in western Canada, most likely satellite remains.