首页
登录
职称英语
Assuming that the engineering problems could be overcome, the production of
Assuming that the engineering problems could be overcome, the production of
游客
2024-01-01
48
管理
问题
Assuming that the engineering problems could be overcome, the production of a time machine could open up a Pandora’s box of causal paradoxes. Consider, for example, the time traveler who visits the past and murders his mother when she was a young girl. How do we make sense of this? If the girl dies, she cannot become the time traveler’s mother. But if the time traveler was never born, he could not go back and murder his mother.
Paradoxes of this kind arise when the time traveler tries to change the past, which is obviously impossible. But that does not prevent someone from being a part of the past.
Suppose the time traveler goes back and rescues a young girl from murder, and this girls grows up to become his mother. The causal loop is now self-consistent and no longer paradoxical. Causal consistency might impose restrictions on what a time traveler is able to do, but it does not rule out time travel per second.
Even if time travel isn’t strictly paradoxical, it is certainly weird. Consider the time traveler who leaps ahead a year and reads about a new mathematical theorem in a future edition of Scientific American. He notes the details, returns to his own time and teaches the theorem to a student, who then writes it up for Scientific American. The article is, of course, the very one that the time traveler reads. The question then arises: Where did the information about the theorem come from? Not from the time traveler, because he read it, but not from the student either, who learned it from the time traveler. The information seemingly came into existence from nowhere, reasonlessly.
The bizarre consequences of time travel have led some scientists to reject the notion outright. Stephen W. Hawking of the University of Cambridge has proposed a "Chronology protection conjecture," which would outlaw causal loops. Because the theory of relativity is known to permit causal loops, chronology protection would require some other factors to intercede to prevent travel into the past. What might this factor be? One suggestion is that quantum processes will come to the rescue. The existence of a time machine would allow particles to loop into their own past. Calculations hint that the ensuring disturbance would become self-reinforcing, creating a runaway surge of energy that would wreck the wormhole. [br] According to the passage, ______ plays an important role which cannot be ignored.
选项
A、the speed of time travel
B、the relationship between people
C、the destination of time travel
D、the length of time travel
答案
A
解析
推断题型通读全文,假设时间旅行者能在现在、过去甚至未来(见文中的各个例子)任意来往,那么显然时间旅行的速度是惊人的,因此答案为A。
转载请注明原文地址:http://tihaiku.com/zcyy/3323468.html
相关试题推荐
1Thefieldofeconomicsstudiesthebasicproblemsthateveryeconomymustface
1Thefieldofeconomicsstudiesthebasicproblemsthateveryeconomymustface
1Thefieldofeconomicsstudiesthebasicproblemsthateveryeconomymustface
BecauseofCanada’sabundantproductionandrelativelysmallpopulation,itisa
I’veknownseveralpeoplewhohaveovercomenail-bitingsimplybybuying50nail
Carbonmonoxidedoesn’tnormallycauseproblemsinawell-ventilatedareawhere
WhentheErieCanalwasbuiltinthe1820’s,itwastheengineeringmarvelofit
WhentheErieCanalwasbuiltinthe1820’s,itwastheengineeringmarvelofit
Hisemotionalproblems______fromhisexperiencesasachild,Ithink.A、stemB、
Greatereffortstoincreaseagriculturalproductionmust______iffoodshortagei
随机试题
NextSeptember,TedandMarie______for20years.A、aremarriedB、havebeenmarr
AccordingtoJohnson,howmuchmoneyistheEPAcurrendyspending?A、750,000,000.
[originaltext]M:Hi.Ihaveareservationfortonight.W:Andyourname?M:It’
农历腊月初八是腊八节(theLabaFestival),在这一天,人们会喝腊八粥。喝腊八粥这一传统起源于印度佛教,在中国已有1000多年的历史。在那
在建筑内部采用挡烟设施分隔而成,能在一定时间内防止火灾烟气向同一防火分区的其余部
下列用药与帕金森无关的是A.金刚烷胺 B.多巴胺 C.肾上腺素 D.苯海索
各级别轿车历年销售份额(%) 因1.6升购置税调整,A级型车市场从2008
企业委托加工一批非金银首饰的应税消费品,收回后直接用于销售。不考虑其他因素。下列
高层建筑为防止侧击雷电,应在环绕建筑物周边设置( )。A.避雷针 B.均压环
通信网按铁路运营方式可分为()。A.共用通信网和专用通信网 B.固定网和移动网
最新回复
(
0
)