NASA's UpperAtmosphereResearch Satellite, or UARS, is expected to reenter the atmosphere at the end of September.
美国国家航空和宇宙航行局的高层大气研究卫星，简称UARS，预计将于九月末返回大气层。
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NASA's UpperAtmosphereResearch Satellite will fall out of orbit soon, with large pieces perhaps reaching Earth's surface, according to NASA's Nick Johnson at a telephone press conference.
The research, federally funded by the National Science Foundation, could improve the safety and reliability of spacecraft that operate in the upperatmosphere.