他们正在试图确定这颗高层大气研究卫星返回大气层的准确时间和地点。
They are trying to determine the satellite UARS returns to the atmosphere of the exact time and place.
美国航天局：这颗报废的“高层大气研究卫星”残骸将会散落在500英里的地方。
这可以使大气层扩大，导致高层大气研究卫星(UARS)比预期更快地下降到地球。
This can make the atmosphere expand, causing UARS to fall to Earth faster than expected.
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。
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。
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.
液态燃料火箭不断得到改进，它用在飞行器上，也被用来研究高层大气和把地球卫星送入轨道。
The liquid fuel rocket, which is continually being improved, is used in aircraft as well as for research in the upper air and for putting earth satellites into orbits.
液态燃料火箭不断得到改进，它用在飞行器上，也被用来研究高层大气和把地球卫星送入轨道。
The liquid fuel rocket, which is continually being improved, is used in aircraft as well as for research in the upper air and for putting earth satellites into orbits.
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