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
What are the chances that we will encounter some alien form of life, as we explore the galaxy. If the argument about the time sc
What are the chances that we will encounter some alien form of life, as we explore the galaxy. If the argument about the time sc
admin
2013-01-15
37
问题
What are the chances that we will encounter some alien form of life, as we explore the galaxy. If the argument about the time scale for the appearance of life on Earth is correct, there ought to be many other stars, whose planets have life on them. Some of these stellar systems could have formed 5 billion years before the Earth. So why is the galaxy not crawling with self designing mechanical or biological life forms? Why hasn’t the Earth been visited, and even colonized. I discount suggestions that UFOs contain beings from outer space. I think any visits by aliens would be much more obvious, and probably also, much more unpleasant.
What is the explanation of why we have not been visited?
One possibility is that the argument about the appearance of life on Earth is wrong. Maybe the probability of life spontaneously appearing is so low that Earth is the only planet in the galaxy, or in the observable universe, in which it happened.
Another possibility is that there was a reasonable probability of forming self-reproducing system, like cells, but most of these forms of life did not evolve intelligence.
A third possibility is that there is a reasonable probability for life to form, and to evolve to intelligent beings, in the external transmission phase. But at that point, the system becomes unstable, and the intelligent life destroys itself. This would be a very pessimistic conclusion. I very much hope it isn’t true.
I prefer a fourth possibility: there are other forms of intelligent life out there, but we have been overlooked. There used to be a project called SETI, the search for extraterrestrial intelligence. It involved scanning the radio frequencies, to see if we could pick up signals from alien civilizations. I thought this project was worth supporting, though it was cancelled due to a lack of funds. But we should have been wary of answering back, until we have developed a bit further. Meeting a more advanced civilization, at our present stage, might be a bit like the original inhabitants of America meeting Columbus. I don’t think they were better off for it.
Which of the following is NOT among the four possibilities of why we haven’t been visited?
选项
A、Forms of life on the other planets don’t evolve to intelligent beings.
B、Earth is the only planet that contains life in the universe.
C、life on the other planets destroys itself
D、Beings from outer space are too far away from us.
答案
D
解析
D不属于作者提到的四种可能性。
转载请注明原文地址:https://kaotiyun.com/show/5b2O777K
0
考博英语
相关试题推荐
AstudybyscientistsinFinlandhasfoundthatmobilephoneradiationcancausechangesinhumancellsthatmightaffectthebr
Inthispart,youareaskedtowriteanessayaccordingtotheoutlinegiven.Youcompositionshouldbeabout200words.Remembe
Thetravellerssoughtshelter______therainandhappenedtofindaroad-sideinn.
Thejoysoftravel,havinglong______thedisabled,areopeninguptovirtuallyanyonewhohasthemeans.
Afteryuppiesanddinkies,anewcreaturefromadlandstalkstheblock.TheNYLON,anacronymlinkingNewYorkandLondon,isa
______enoughtimeandmoney,theresearcherswouldhavebeenabletodiscovermoreinthisfield.
Duringaninternationalcrisis,many____messageswillgenerallyemanatefromthepresident’soffice.
Ms.Rice,withcustomaryclass,simplyexpressedhopethatthisepisodewouldn’t_____thecharityinspiteofthepreviousscandals
Fewerandfeweroftoday’sworkersexpecttospendtheirworkinglivesinthesamefield,_______thesamecompany.
1.Theconceptionthatonemustgettoknowhisneighborshasdiedoutinpopulouscities,butitstillexistsinsmalltownsand
随机试题
一次性抚恤金是以货币形式给予其遗属的一次性物质抚慰,而定期抚恤金是按()给予的抚恤金。
简述国际市场营销中影响价格的主要因素。
关于甲状腺结节的诊断,以下正确的是
大柴胡汤重用生姜,是由于症见
依据资源税的有关规定,下列说法中正确的是()。
某生产企业,2012年有关会计资料如下:(1)年度会计利润总额为300万元;(2)全年销售收入为3000万元;(3)“管理费用”中列支的业务招待费30元,广告费和业务宣传费500万元;(4)“营业外支出”中列支的税收罚款1
下列措施中,有可能导致盈亏临界点降低的有()。
春秋时期,郑国和晋国公布成文法,受到()的批评。
对系统分析中目标分析的正确描述是()。
Economistssaythatmerelyraisingtheminimumwagewouldhavea(n)______effectonemploymentrates.
最新回复
(
0
)