首页
登录
职称英语
The marvelous telephone and television network that has now enmeshed the whol
The marvelous telephone and television network that has now enmeshed the whol
游客
2025-04-25
32
管理
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. [br] 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:http://tihaiku.com/zcyy/4053406.html
相关试题推荐
Withinhoursofappearingontelevisiontoannouncetheendofconscription,
Withinhoursofappearingontelevisiontoannouncetheendofconscription,
Withinhoursofappearingontelevisiontoannouncetheendofconscription,
Withinhoursofappearingontelevisiontoannouncetheendofconscription,
Themarveloustelephoneandtelevisionnetworkthathasnowenmeshedthewhol
Themarveloustelephoneandtelevisionnetworkthathasnowenmeshedthewhol
Thechangingimageofthefamilyontelevisionprovides______intochangingatt
Inatelephonesurveyofmorethan2,000adults.21%saidtheybelievedthe
Inatelephonesurveyofmorethan2,000adults.21%saidtheybelievedthe
Inatelephonesurveyofmorethan2,000adults.21%saidtheybelievedthe
随机试题
Peoplehaveattemptedtosimulatehumanvoicesinmachinesforquitesometi
全身麻醉时,循环系统的并发症不包括以下哪项()A.高血压 B.低血压 C
在全国中小企业股份转让系统挂牌的公司可以采取下列哪些方式转让股票() Ⅰ.协
该县2005年第三产业实收资本增长率约为()。A.21% B.37%
李家庄是远近闻名的大村,居住村民有3000多人,且由于村民经济收入的增长,很多村
业主大会会议应当有物业管理区域内()的业主参加。 A.专有部分占建筑
参与一碳单位代谢 A.维生素B6B.维生素B2 C.维生素B12D.四氢
下列各项中,属于“态度或借口”舞弊风险因素的是()。A.治理层对财务报告过
一平面简谐波在弹性媒质中传播,在某一瞬时,某质元正处于其平衡位置,此时它的(
公路工程常用的流水参数中,属于工艺参数的是()。A.施工段 B.施工过程数
最新回复
(
0
)