首页
登录
职称英语
Scientists have taken a giant leap toward making possible the dream of buildi
Scientists have taken a giant leap toward making possible the dream of buildi
游客
2023-12-22
71
管理
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. [br] 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://tihaiku.com/zcyy/3296181.html
相关试题推荐
Constructionofthegiganticofficebuildinginthiscitywasforyearsintermit
Scientistsaremakinghugestridesinbattlingoneofthetopthreekillerdisea
Ourgratefulthanksare________tothepolicedepartment’shelpinthemakingof
Iwouldhavefinishedmypaperifitwasatallpossible,butIwasfullyoccupi
Toweakenthedamageforearthquakes,scientistsareworkingonwaystoenablea
Mostscientistsbelieveitislegitimatetouseanimalsinmedicalresearch.A、de
Manyfarmershavetakenadvantageofrainwhenitisgoingtocome,bymakingha
"You’llsortitout,"heassuredhercallouslyastheyenteredthebuilding,and
Healthsystemsstrengthening—which,inglobalhealthspeak,meansbuildingandr
[originaltext]Italianscientistshaveraisednewhealthconcernsaboutthesafe
随机试题
端午节为每年农历五月初五。这是一个古老的传统节日,已有2000多年的历史。关于端午节的由来,说法很多。但最广为认可的一种说法是为纪念在这一天投江自尽的爱
Ronaldofirstbecamethestarofasoccerclubattheageof[br][originaltext
在以下选项中,不属于艺术创作心理要素的是()A.审美感知 B.审美想象 C
下列都位应设置排烟防火阀()A.垂直风管与每层水平风管交接处的水平管段上
无机结合料稳定材料结构层按()公路等级规定了7d无侧限抗压强度代表值。A.
假如你即将要走上讲台,你感觉自己对于教师这一职业的优势和的不足分别是什么?
财政收入规模也被称为财政收入的()。A.比例结构 B.数量界限 C.质量效益
共用题干 一般资料:求助者,女性,17岁,高中二年级学生。案例介绍:求助者一年
混凝土运输过程中,因故停歇过久,应按不合格料处理的情况包括()。A.混凝土产生
(2020年真题)根据《建设工程项目管理规范》,项目管理机构负责人的权限有(
最新回复
(
0
)