<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区

          Remains of satellite may never be found, NASA says

          Updated: 2011-09-25 11:25

          (Agencies)

            Comments() Print Mail Large Medium  Small 分享按鈕 0

          CAPE CANAVERAL, Fla. - A six-tonne NASA science satellite crashed to Earth on Saturday, leaving a mystery about where a tonne of space debris may have landed.

          The US space agency said it believes the debris ended up in the Pacific Ocean, but the precise time of the bus-sized satellite's re-entry and the location of its debris field have not been determined.

          Remains of satellite may never be found, NASA says

          NASA conceptual image shows the Upper Atmosphere Research Satellite (UARS), launched on September 15, 1991, by the space shuttle Discovery. [Photo/Agencies]

          The Upper Atmosphere Research Satellite, or UARS, ended 20 years in orbit with a suicidal plunge into the atmosphere sometime between 11:23 pm on Friday and 1:09 am EDT on Saturday (0323 to 0509 GMT Saturday), NASA said.

          The satellite would have been torn apart during the fiery re-entry, but about 26 pieces, the largest of which was estimated to have weighed 330 pounds (150 kg), likely survived the fall, officials said.

          As it fell to Earth, UARS passed from the east coast of Africa over the Indian Ocean, then the Pacific Ocean, across northern Canada and the northern Atlantic Ocean to a point over West Africa. Most of the transit was over water, with some flight over northern Canada and West Africa, NASA said.

          "Because we don't know where the re-entry point actually was, we don't know where the debris field might be," said Nicholas Johnson, chief orbital debris scientist at NASA's Johnson Space Center in Houston. "We may never know."

          Stretching 35 feet (10.7 meters) long and 15 feet (4.6 meters) in diameter, UARS was among the largest spacecraft to plummet uncontrollably through the atmosphere, although it is a slim cousin to NASA's 75-tonne (68,000 kilogram) Skylab station, which crashed to Earth in 1979.

          Russia's last space station, the 135-tonne (122,000 kilogram) Mir, crashed into the Pacific Ocean in 2001, but it was a guided descent.

          NASA now plans for the controlled re-entry of large spacecraft, but it did not when UARS was designed.

          The 13,000-pound (5,897 kg) satellite was dispatched into orbit by a space shuttle crew in 1991 to study ozone and other chemicals in Earth's atmosphere.

          It completed its mission in 2005 and has been slowly losing altitude ever since.

          With most of the planet covered in water and vast uninhabited deserts and other land directly beneath the satellite's flight path, the chance that someone would be hit by falling debris was 1-in-3,200, NASA said.

          "The risk to public safety is very remote," it said.

          The satellite flew over most of the planet, traveling between 57 degrees north and 57 degrees south of the equator.

          UARS was one of about 20,000 pieces of space debris in orbit around Earth. Something the size of UARS falls back into the atmosphere about once a year.  

             Previous Page 1 2 3 Next Page  

          Related Stories

          Lifeless satellite falls back to Earth 2011-09-24 07:53
          Tumbling satellite to miss North America 2011-09-23 15:27
          主站蜘蛛池模板: 欧美乱码伦视频免费| 狠狠婷婷色五月中文字幕| 日韩av在线不卡一区二区三区 | 亚洲av精选一区二区| 野花社区www视频日本| 欧美激情综合一区二区三区| 四虎精品永久在线视频| 亚洲色大成网站www在线观看| 久久亚洲精品中文字幕无| 亚洲精品天堂在线观看| 少女たちよ在线观看| 日本免费一区二区三区久久| 巨胸不知火舞露双奶头无遮挡| 色偷偷中文在线天堂中文| 国产精品妇女一区二区三区 | 国产精品自拍午夜福利| 韩国亚洲精品a在线无码| 日韩中文字幕高清有码| 日韩国产精品无码一区二区三区| 国产免费一区二区三区在线观看 | 日日夜夜噜噜视频| 粉嫩av国产一区二区三区| 国产精品国产三级国快看| 精人妻无码一区二区三区| 久久国产精品乱子乱精品| 精品999日本久久久影院| 国产小嫩模无套中出| 国产精品精品一区二区三| 欧美喷水抽搐magnet| 夹得好湿真拔不出来了动态图| 国产av日韩精品一区二区| 久久天天躁狠狠躁夜夜2020老熟妇| 中文字幕午夜福利片午夜福利片97| 91福利一区福利二区| 诱人的岳hd中文字幕| 亚洲av无码精品色午夜蛋壳| 天堂国产+人+综合+亚洲欧美| 国产精品一区中文字幕| 最新亚洲人成无码网站欣赏网| 视频在线只有精品日韩| 国厂精品114福利电影免费|