首页
登录
职称英语
[originaltext] Astronomers have spent hundreds of years searching for signs
[originaltext] Astronomers have spent hundreds of years searching for signs
游客
2024-05-12
13
管理
问题
Astronomers have spent hundreds of years searching for signs of life on other planets, using telescopes. When they saw the geography of Mars, they thought they could see canals and that this might be evidence of intelligent life on the planet. More recently, however, spacecraft have been sent to analyze the soil for signs of life. The results were negative and astronomers are now convinced that no life exists on the surface of any other planet in our solar system. To send a spacecraft far beyond our solar system is not realistic because of the huge distances involved.
The only way we are likely to know of its existence is from radio messages unless life comes and visits us. Listening for intelligent life is not a new idea, but the techniques now being used to offer much better chance of success than before. Looking for evidence of life in other solar systems now means using special radio receivers called radio telescopes to listen out for messages. The assumption is that intelligent forms of life would have discovered radio waves and would, like us, be using them to communicate.
Through its research work, astronomers have developed two means of systematically searching for intelligent life. The first method is to select the closet 800 stars like our sun and to direct a radio telescope to scan each one of them for electromagnetic waves. The second way is to survey the entire sky, listening for continuous signals. All this, as well as the chance of discovering that maybe we are not alone in the universe!
选项
A、Intelligent life.
B、Canals of some kind.
C、Signs of life.
D、Natural resources.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3595105.html
相关试题推荐
[originaltext]DuringtheearlyAmericancolonialyears,cornwasmoreplent
[originaltext]Ifyouseizethestemofanettle(荨麻)firmly,perhapswitht
[originaltext]Ifyouseizethestemofanettle(荨麻)firmly,perhapswitht
[originaltext]Man’sfirstrealinvention,andoneofthemostimportantinv
[originaltext]Man’sfirstrealinvention,andoneofthemostimportantinv
[originaltext]M:Morning.Happytomeetyouhere.Howareyouandhowisyourw
[originaltext]W:Oh,hi,Daniel.(19)Areyougoingtothein-servicegainingt
[originaltext]BillGateswasborninSeattle,Washingtonin1955.Heco-fou
[originaltext]BillGateswasborninSeattle,Washingtonin1955.Heco-fou
[originaltext]BillGateswasborninSeattle,Washingtonin1955.Heco-fou
随机试题
NarratorListentoatalkonhomeautomationinamechanicalengineering
[originaltext](12)WhenHolly,thehousecat,turnedupamilefromtheWes
[originaltext]M:So,Susan,doyouhaveanythingplannedforthisSaturday?W:
下列各项中,属于变量抽样法的有:A.单位均值估计法 B.差异估计法 C.比率
不属于护理理论四个基本概念的是()。A.人 B.健康 C.保健 D.环境
施工单位在施工现场从事危险作业人员的意外伤害保险费应由( )支付。A.作业人员
某小组已经进入了中期转折阶段,在一次小组活动中,组员老张质疑社会工作者小李某些做
简述现代企业人力资源管理各个历史发展阶段的特点。
(2016年真题)在预算执行过程中,可能导致预算调整的情形有()。A.主要产品市
总进度纲要的主要内容包括项目实施的总体部署和()。A.总进度规划 B.各子系
最新回复
(
0
)