NASA's Upper Atmosphere Research 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 Upper Atmosphere Research 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.

美国国家航空和宇宙航行局发言人尼克·约翰逊在一个电话新闻发布会中表示，美国国家航空和宇宙航行局的高层大气研究卫星即将脱离轨道，大片的残余物可能会落到地球表面。

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The research, federally funded by the National Science Foundation, could improve the safety and reliability of spacecraft that operate in the upper atmosphere.

此项研究由美国国家科学基金会拨款，旨在提高航天器在高层大气中运行时的安全性和可靠性。

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The US space agency says the risk to life from the Upper Atmosphere Research Satellite (UARS) is 1 in 3, 200.

BBC: Nasa refines satellite crash time

The Upper Atmosphere Research Satellite (UARS) is the largest American space agency satellite to return uncontrolled into the atmosphere in about 30 years.

BBC: Nasa's UARS satellite falls off west coast of US