英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

Defunct U.S. satellite crash avoidable: Chinese expert

时间:2011-09-24 06:50来源:互联网 提供网友:helloella   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

   BEIJING, Sept. 23 (Xinhua) -- A defunct1 U.S. satellite is expected to crash down to Earth Friday, with nobody knowing where or when exactly it will hit. This was avoidable, a Chinese expert said Thursday.

  Pang2 Zhihao, a researcher from the Chinese Research Institute of Space Technology, told Xinhua that the crash could have been avoided had the satellite been put into a higher orbit, or manipulated to drop in the South Pacific when it had abundant fuel. It would pose no threat to Earth if these measures had been taken.
  NASA's tumbling, 5,900 kg Upper Atmosphere Research Satellite, or UARS, is the first of such man-made space vehicles that have been launched into outer space according to the agency's Mission to Planet Earth. The mission was launched in the 1990s.
  The mission is designed to provide data for better understanding Earth's upper atmosphere and the effects of natural and human interactions on the atmosphere.
  The satellite was deactivated3 in 2005 as it ran out of fuel and was left orbiting Earth like a big piece of space junk.
  There are other cases of defunct satellites. The European Space Agency said earlier its observation satellite ERS-2 has run out of fuel and is deorbiting. It would therefore also crash sooner or later.
  Pang said all countries which are operating space vehicles should take care of their own spacecrafts so that they won't pose any danger.
  The expert also said that the public need not worry too much.
  Pang said most spacecrafts will be incinerated upon re-entering Earth's atmosphere, and the debris4 will mostly likely fall into the ocean or hit an uninhabited area. In addition, a debris tracker is able to give a comparatively accurate prediction where the craft will fall about two hours before it hits Earth, giving residents, if there are any, time to evacuate5.
  He added that there are several ways to minimize the threat of decommissioned spacecrafts, like putting them into higher orbits and crashing them into designated waters.
  Scientific progress would possibly bring about more ways of dealing6 with tumbling satellites. Scientists have already been trying to build spacecrafts with degradable materials so that they can self-destruct when re-entering Earth's atmosphere.

点击收听单词发音收听单词发音  

1 defunct defunct     
adj.死亡的;已倒闭的
参考例句:
  • The scheme for building an airport seems to be completely defunct now.建造新机场的计划看来整个完蛋了。
  • This schema object is defunct.No modifications are allowed until it is made active again.此架构对象不起作用。在重新激活之前,不能进行任何改动。
2 pang OKixL     
n.剧痛,悲痛,苦闷
参考例句:
  • She experienced a sharp pang of disappointment.她经历了失望的巨大痛苦。
  • She was beginning to know the pang of disappointed love.她开始尝到了失恋的痛苦。
3 deactivated 7c04d50ec1496027d0ed6fd0d6f00a85     
v.解除动员( deactivate的过去式和过去分词 );使无效;复员;使不活动
参考例句:
  • \"The brain can be deactivated. It can be yours to command.\" “大脑计算机可以被停止。如果你下达命令的话。” 来自互联网
  • He successfully deactivated a nuclear reactor in a laboratory before meltdown. 他成功停用一个核反应堆在实验室之前崩溃。 来自互联网
4 debris debris     
n.瓦砾堆,废墟,碎片
参考例句:
  • After the bombing there was a lot of debris everywhere.轰炸之后到处瓦砾成堆。
  • Bacteria sticks to food debris in the teeth,causing decay.细菌附着在牙缝中的食物残渣上,导致蛀牙。
5 evacuate ai1zL     
v.遣送;搬空;抽出;排泄;大(小)便
参考例句:
  • We must evacuate those soldiers at once!我们必须立即撤出这些士兵!
  • They were planning to evacuate the seventy American officials still in the country.他们正计划转移仍滞留在该国的70名美国官员。
6 dealing NvjzWP     
n.经商方法,待人态度
参考例句:
  • This store has an excellent reputation for fair dealing.该商店因买卖公道而享有极高的声誉。
  • His fair dealing earned our confidence.他的诚实的行为获得我们的信任。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   defunct  crash  defunct  crash
顶一下
(0)
0%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴