首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Scientists have taken a giant leap toward making possible the dream of building a powerful telescope on the moon that could with
Scientists have taken a giant leap toward making possible the dream of building a powerful telescope on the moon that could with
admin
2018-06-06
36
问题
Scientists have taken a giant leap toward making possible the dream of building a powerful telescope on the moon that could withstand even the harshest of lunar conditions.
Writing in Thursday’s edition of the journal Nature, they said they coated a special type of liquid surface with a layer of silver to make a highly reflective mirror like one that could be used in any future, moon-based telescope.
"It’s the breakthrough that we need," lead researcher Ermanno Borra of Universite Laval in Quebec, Canada, said in a telephone interview. "If you want to have a liquid mirror telescope on the moon, you need the right liquid. If you don’t have the right liquid, forget it. It’s as simple as that." Borra envisions a telescope with a liquid mirror measuring 66 feet to 328 feet wide.
Such a telescope, which has drawn NASA’s interest, could provide astronomers on Earth unprecedented views into distant reaches of the universe, studying objects far more faint even than NASA’s planned James Webb Space Telescope, due for a 2013 launch. Astronomers hope such an instrument could allow them to study the early phases of the universe after the Big Bang.
Advocates say a large telescope on the moon would be more cheaply and easily built using a liquid mirror rather than a conventional glass one. The researchers think any liquid-mirror telescope on the moon would not come before 2020 at the earliest.
The scientists made use of a liquid made of "ionic salts" that remains fluid at super-low temperatures. They deposited a thin layer of chromium particles on the liquid, then added a layer of silver particles to complete the mirror.
Liquid mirror telescopes differ from conventional ones in that their primary mirrors, which gather and focus light, are made of reflective liquid instead of polished glass. The liquid can be poured into a spinning container, spreading out to make a thin, smooth, parabolic shape that can be used as a telescope mirror, the researchers said.
The silver layer that is created is completely smooth, highly reflective, can stay stable for months, and the ionic liquid that it covers does not evaporate, the researchers said.
What is the main idea expressed in the passage?
选项
A、Ermanno Borra of Universite Laval as a leading role in the research.
B、The feats of Astronomers by using the liquid mirror telescope.
C、The silver layer used in the liquid mirror telescope.
D、The dream of building a liquid mirror telescope on the moon.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/InSO777K
本试题收录于:
NAETI中级口译笔试题库外语翻译证书(NAETI)分类
0
NAETI中级口译笔试
外语翻译证书(NAETI)
相关试题推荐
Thereisamythouttherethattoomanypeoplebelieve:thatwhenwereachacertainage,wecannolongerbehappy,independent
Thereisamythouttherethattoomanypeoplebelieve:thatwhenwereachacertainage,wecannolongerbehappy,independent
Thewriterreceiveda________amountofpraiseforhisnewlypublishednovel.
下面你将听到外国媒体就中国艾滋病问题的一段评论。HIV/AIDSisnowrecognizedclearlyasagrowingthreattoChina.AccordingtoofficialChineseesti
下面你将听到一段关于中国教育状况的介绍。中国人历来重视教育,实施“独生子女”政策后尤为如此。中国家庭的平均教育支出约占其收入的15%,而据中国社会调查所的一项研究成果显示,有43%的家庭都设立了专门账户,用来支付孩子的教育费用。近年来,
我国金融改革的不断深化将为外资银行与中资银行的合作带来新的机遇。银监会鼓励外资银行通过参股中资银行,在业务、客户和市场方面获得突破;同时,在公司治理、内控、风险管理和经营理念方面带来先进的经验和做法,使中、外资银行在合作中共同获得发展。作为深化金
在中关建交25周年前夕,我应布什总统的邀请正式访问贵国。纽约是我访美的第一站,在这里能与各位新老朋友欢聚一堂,我感到很高兴。在此我要特别感谢美国银行家协会的盛情款待,向多年来为推动中美经贸合作做出积极贡献的各位朋友表示敬意!并通过你们向伟大的美国人民致以诚
作为一名运动员、教练员和体育管理者,尤其是作为奥运会的技术官员,我最大的体会是:在奥运会中,没有什么比运动员的利益更重要了。我们整个奥运计划的制定是以运动员需要为中心的。//在做任何决定时,我们都要问一问自己,什么对奥运会和残奥会运动员最有利。在国际单项体
随着中国实现总量控制的目标所面临的挑战日益严峻,以部门为基础分配减排责任的可能性越来越大。另外,根据最新修订的《空气清洁条例》,排放许可最终被赋予了法律地位,并在指定和执行减排义务中起指导性作用。//根据这两项最新的政策进展,美国环保协会已经和国家环保总局
下面你将听到一段有关中美贸易关系的讲话。在冷战结束后的新形势下,两国要不要及如何发展双边关系,是中美两国面临的重大课题。“永久正常贸易关系”的通过表明,在美国,支持发展中美关系的力量占了上风,美国政府、国会、工商企业界和公众的主流都支持以建设性的
随机试题
社交需求
通过对公司现金流量表的分析,可以了解()。
能将2H+游离于介质而将电子递给细胞色素的是
母牛分娩后不久食欲减退,厌食精料,反刍和嗳气停止,排少量糊状粪便。左腹肋弓部膨大,冲击式触诊可听到液体震荡音,穿刺液中无纤毛虫。直肠检查可感知右侧腹腔上部空虚。若在左侧膨大区听诊同时叩诊,可能会听到()。
施工项目经理是企业法定代表人在承包的建设工程施工项目上的()。
同级政府财政部门预拨的下期预算款和没有纳入预算的暂付款项,以及采用实拨资金方式通过本单位转拨给下属单位的财政拨款,应通过()科目核算。
ABC会计师事务所2018年2月1日承接了C公司2017年度财务报表审计业务,甲注册会计师负责该项业务,于2018年3月1日完成审计工作,3月3日,完成审计报告并签字,并决定不再继续承接该公司的审计业务,3月20日,甲注册会计师在整理工作底稿时发现,一张存
在实时操作系统中最常采用的进程调度算法是
输入下列文字,段落设置为左缩进2厘米、右缩进-0.4厘米、首行缩进2厘米,按左对齐的格式进行排版,并以WD01A.DOC为文件名保存在指定文件夹下。如今,依靠巨量的用户基础,被称为1.0的部分传统网站已经能够从互联网增值服务上获得收入。2.
"Howdidyouspendthenight?""Wehadaveryhardtime______someoftheproblem."
最新回复
(
0
)