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
The marvelous telephone and television network that has now enmeshed the whole world, making all men neighbors, cannot be extend
The marvelous telephone and television network that has now enmeshed the whole world, making all men neighbors, cannot be extend
admin
2013-01-15
72
问题
The marvelous telephone and television network that has now enmeshed the whole world, making all men neighbors, cannot be extended into space. It will never be possible to converse with anyone on another planet. Even with today’s radio equipment, the messages will take minutes--sometimes hours--on their journey, because radio and light waves travel at the same limited speed of 186, 000 miles a second.
Twenty years from now you will be able to listen to a friend on Mars, but the words you hear will have left his mouth at least three minutes earlier, and your reply will take a corresponding time to reach him. In such circumstances, an exchange of verbal messages is possible--but not a conversation.
To a culture which has come to take instantaneous communication for granted, as part of the very structure of civilized life, this "time barrier" may have a profound psychological impact. It will be a perpetual reminder of universal laws and limitations against which not all our technology can ever prevail. For it seems as certain as anything can be that no signal--still less any material object--can ever travel faster than light.
The velocity of light is the ultimate speed limit, being part of the very structure of space and time. Within the narrow confines of the solar system, it will not handicap us too severely. At the worst, these will amount to twenty hours--the time it takes a radio signal to span the orbit of Pluto, the outer most planet.
It is when we move out beyond the confines of the solar system that we come face to face with an altogether new group of cosmic reality. Even today, many otherwise educated men--like those savages who can count to three but lump together all numbers beyond four--cannot grasp the profound distinction between solar and stellar space. The first is the space enclosing our neighboring worlds, the planets, the second is that which embraces those distant suns, the stars, and it is literally millions of times greater. There is not such abrupt change of scale in the terrestrial affairs.
Many conservative scientists, shocked by these cosmic gulfs, have denied that they can ever be crossed. Some people never learn, those who sixty years ago laughed at the possibility of flight, and ten years ago laughed at the idea of travel to the planets, are now quite sure that the stars will always be beyond our reach. And again they are wrong, for they have failed to grasp the great lesson of our age--that if something is possible in theory, and no fundamental scientific laws oppose its realization, then sooner or later it will be achieved.
One day we shall discover a really efficient means of propelling our space vehicles. Every technical device is always developed to its limit and the ultimate speed for spaceships is the velocity of light. They will never reach that goal, but they will get very near it. And then the nearest star will be less than five years of voyaging from the earth.
Conservative scientists who deny that cosmic gulfs can ever be crossed will ______.
选项
A、laugh at the very idea of flight
B、learn a lesson as they did ten years ago
C、find space travel beyond their reach
D、oppose the fundamental scientific laws
答案
C
解析
认为宇宙中的鸿沟无法跨越的、保守的科学家会觉得到太空中去旅行是他们力所不及的事情。第六段指出:有些人从不学习,60年前嘲笑飞行的可能性的人,10年前嘲笑到行星上去旅行的想法的人如今深信,我们无法到恒星上去。
转载请注明原文地址:https://www.kaotiyun.com/show/bs2O777K
0
考博英语
相关试题推荐
EducationinRussiaandtheothernewcountriesfacesespeciallydauntingobstaclesbecausethestrugglingeconomiesofthesena
Itcancauseahiporwrist______fromasimplefall,anditdecreaseslifeexpectancybecauseitistheleadingcauseofaccid
ThetwoclawsofthematureAmericanlobsteraredecidedlydifferentfromeachother.Thecrusherclawisshortandstout;thec
Evenplantscanrunafever,especiallywhenthey’reunderattackbyinsectsordisease.Butunlikehumans,plantscanhavethei
Themunicipalplanningcommissionsaidthattheirfinancialoutlookforthenextyearwasoptimistic.Theyexpectincreasedtax
Engineeringstudentsaresupposedtobeexamplesofpracticalityandrationality,butwhenitcomestomycollegeeducationIam
Ourshasbecomeasocietyofemployees.AhundredyearsorsoagoonlyoneoutofeveryfiveAmericansatworkwasemployed,i.
InatotalofsixstatesinthemiddleofAmerica,15,000assembly-lineworkersare【1】Japanesecarstogether.Theseautoworkers
______springsnotoutoftrueanddeepadmiration,butmoreoftenoutofaself-seekingwishtoidentifywithsomeoneimportant
Nonetheless,multi-regionalists______foldingtheirtentsandifanything,mayhavegrownevenmoreconvincedoftheirposition
随机试题
有关主诉的内容,不正确的是
解毒,除湿,利关节清热解毒,利湿退黄
根据《建设工程质量管理条例》,建设工程承包单位向建设单位出具的质量保修书中应明确建设工程的()。
税款征收的方式包括()。
根据《民法通则》的规定,如果被代理人出具的授权委托书授权不明,下列说法错误的有()。
当事人提出证据证明仲裁裁决有依法应撤销情形的,可在收到裁决书之日起1年内,向仲裁委员会所在地的基层人民法院申请撤销仲裁裁决。()
甲公司为上市公司,20×6年至20×9年甲公司发生的相关事项如下。(1)20×6年1月1日,甲公司以银行存款800万元取得乙公司80%的股权,当日即取得对乙公司的控制权。购买日乙公司可辨认净资产的公允价值为900万元,账面价值为1000万元(其中股本60
2010年高考揭榜时,各地高考状元再次进入大众视野,成为当季最受瞩目的“明星”。然而,一份调查报告显示,1977年至2008年32年间的1000余位高考“状元”中,没发现一位是做学问、经商、从政等方面的顶尖人才,他们的职业成就远低于社会预期。仅调查报告里的
更适合于开发互联网络应用的程序设计语言是_______。
Lineslandmbelowareparallel.Findthevaluesofxandy.
最新回复
(
0
)