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
73
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
Intheworldofmanagement,employeesarenonexemptorexempt,dependingonwhethertheygetpaidforovertimeornot.【21】acrea
Violinprodigies,Ilearned,havecomeindistinctwavesfromdistinctregions.Mostofthegreatperformersinthelate19than
Theworld’sfirstinternet______hasbeencancelledbecauseoflackofinterest.
AsthecaseofAmitarRayandhisfamilyexemplifies,professionalimmigrantsareamongthemostrapidly______firstbecauseof
Forlaymenethnologyisprobablythemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsin
Thegoalsanddesires______widelybetweenmenandwomen,betweentherichandthepoor.
Perhapsthemostinterestingthingaboutthephenomenonoftaboobehaviorishowitcanchange【1】theyearswithinthesamesocie
Herpanicwastransient,andceasedwhenshebegantospeak.
AstronautJimVosshasenjoyedmanymemorablemomentsinhiscareer,includingthreespaceflightsandonespacewalk.Buthere
Hewas_______whenheheardtheunexpectednews,butIfinallyconvincedhim.
随机试题
Ideasabout"spoiling"childrenhavealwaysinvolvedconsiderationofjustwhatisaspoiledchild,howdoesspoilingoccur,and
在有关国计民生的著述方面。明代称得上大放异彩。下列属于这方面著作的是
Itwasanearlymorninginsummer.Inthestreets,sleepy-eyedpeopleweremovingquickly,headingtowardstheir【61】.Thiswast
研究产业结构变动规律和探求其合理化的重要依据是( )。
质量问题处理完毕,监理工程师写出的质量问题处理报告应报( )存档。
下列属于超过一定规模的危险性较大的分部分项工程的有()。
保理业务中银行提供的金融服务主要有()
当数据库出现故障时要对数据库进行恢复,恢复的原理是_____,常用的技术是数据转储和______。
SegregationinEducationUntilthe1950s,theequal【1】providedbythe14thAmericansofdifferentorigins.【1】______In1896,
CommonFaultsandEyeMovementThereareanumberofbadhabitswhichpoorreadersadopt.Mostoftheseinvolveusingextra
最新回复
(
0
)