美国6吨半卫星被破坏失控，马上要撞向塔洲？

人类真是太坏了,恶报接种而至。

前几天还俄罗斯那 怎么就变塔洲了

德国报废卫星将坠落地球 最大碎片重400公斤
新闻来源: 每日电讯报 于September 24, 2011

英国媒体报道称，在美国“高层大气研究卫星”24日向地球坠落之际，专家发现，德国一颗报废卫星也将在10月末与地球“相遇”。这颗卫星残骸最大的碎片将有美国今日坠毁卫星最大碎片的3倍重，它造成地球人员伤亡及财产损失的机率是两千分之一。

　　英国每日电讯报9月24日报道称，这颗德国发射的“伦琴天文卫星”重2.4吨，在制导系统出故障后于1999年报废后，在太空无目标遨游了12年。最初，德国认为它将在重入大气后被完全烧毁，但现在它运行的轨道越来越接近地球。专家称，它的残骸最早将于今年10月末撞击地球，最大碎片有400公斤，是美国今日坠毁卫星最大碎片的3倍重。

　　据NASA的专家计算，伦琴天文卫星的坠毁引起人员伤亡或财产损失的机率是两千分之一，比这次美国的高层大气研究卫星高出近一倍。美国高层大气研究卫星的碎片一共是26块，而德国卫星则有30块。

　　专家还警告说，伦琴天文卫星不会是最后一颗袭击地球的卫星，因为2012年人类密集的太空活动有可能损坏更多老化的航天器，使它们跌落地球。

在家呆着

Space junk fall a close call

THE eyes of NASA scientists were fixed closely on Tasmania yesterday as a 5 1/2-tonne piece of American space junk fell to Earth.

For some of the early afternoon, the scientists believed Tasmania could be in the path of the debris from the break-up of a US satellite.

Later re-entry predictions posted by the US Center for Orbital and Re-entry Debris Studies showed the junk coming down south of Heard Island in the southern Indian Ocean.

The island is part of Australian sub-Antarctic territory and well known to Tasmanian-based marine scientists and biologists.

Part of the debris path was estimated to be less than 10 minutes' falling time from Tasmania, according to modelling.

The satellite was expected to break up into about 26 pieces ranging from 1kg to 158kg.

Last night NASA was still trying to determine exactly where the debris had landed.

It believed the decommissioned Upper Atmosphere Research Satellite had fallen to Earth between 1.23pm and 3.09pm Tasmanian time.

NASA confirmed that some of the debris had penetrated the atmosphere over the Pacific Ocean, with the precise time and location unknown.

The satellite's flight path took in several passes over Australia, including Tasmania.

There was about a one-minute window around 3pm when Australians on the east coast might have spotted the satellite.

Tasmanian astronomer Shevill Mathers, of the Southern Cross Observatory, said even if parts of the satellite had passed over Tasmania they would have been extremely difficult to see in daylight.

However, Mr Mathers, who has been involved in astronomy for 40 years, said that was the experience he had one day in the early 1970s when he inadvertently captured some space junk on film.

"I have actually in the past caught a piece of space junk in daylight. I was taking a picture on Constitution Dock. It was later tracked down to be some sort of Russian space junk," he said.

Mr Mathers said that on a clear night space junk could appear "pretty spectacular".

Entering the atmosphere, it could appear as multiple specks of light or an extra bright meteor but might be visible for only a few seconds.

The UARS was launched in September 1991 and was decommissioned in December 2005.

UARS was the biggest NASA satellite to fall to Earth since Skylab, which landed in Western Australia in 1979.

http://www.themercury.com.au/art ... 21_todays-news.html

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背景新闻

美国6吨半卫星被破坏失控，马上要撞向地球(图)
2011-09-06 07:34:30.0


　　美国太空监测部门称，一颗重达6吨的美国失控卫星正向地球飞驰而来，将于两周后撞向地球，可能坠落范围在南北纬57度之间。

　　原先预计这颗名为UARS的卫星将于9月19日撞上地球表面，但由于速度加快，专家认为撞击将提前两天发生。莫斯科位于北纬55度44分，在坠落范围之内。

　　失控卫星不会整个撞向地球，而是分成几个部分，因为它已被一个不明物体撞坏。美国专家称，“肇事者”是“宇宙-1275”号苏联卫星。

　　失控卫星于1991年由美国发射，为了研究大气层外层以找出臭氧洞形成的原因。

　　但项目开支连世界上预算最为庞大的美国航天局也难以承受。


　　由于每年1000万美元的使用费过于高昂，这颗卫星被放弃。航天局曾打算借助航天飞机把这颗卫星从轨道上“摘下来”，但未能付诸行动。

　　俄罗斯专家对卫星撞地球持怀疑态度。《航天新闻》月刊的编辑伊戈尔·利索夫认为，卫星残骸坠落莫斯科的可能性非常小。

　　他说:“它进入大气层最有可能的范围还是赤道地带，因为该地区地表更厚，大气层更高。当然，有一些风险，但小得可以忽略不计，因为55年来从未发生过航天器坠落造成人员伤亡的案例。

　　专家表示，可在坠落前几天算出具体的坠落坐标，那时美国太空垃圾监测系统也能开始“处理问题”。