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
考研
What is a black hole? Well, it’s difficult to answer this question, since the terms we would normally use to describe a scientif
What is a black hole? Well, it’s difficult to answer this question, since the terms we would normally use to describe a scientif
admin
2014-10-03
86
问题
What is a black hole? Well, it’s difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region of space(not a thing)into which matter has fallen and from which nothing can escape not even light. So we can’t see a black hole. A black hole exerts a strong gravitational pull and yet it has no matter. It is only space—or so we think. How can this happen?
The theory is that some stars explode when their density increases to a particular point; they collapse and sometimes a supernova occurs. From Earth, a supernova looks like a very bright light in the sky which shines even in the daytime. The most convincing evidence of black holes comes from research into binary star systems. Binary stars, as their name suggests, are twin stars whose position in space affects each other. In some binary systems, astronomers have shown that there is an invisible companion star, a " partner" to the one which we can see in the sky. Matter from the one which we can see is being pulled towards the companion star. Could this invisible star, which exerts such a great force, be a black hole? Astronomers have evidence of a few other stars too, which might have black holes as companions.
The story of black holes is just beginning. Speculations about them are endless. There might be a massive black hole at the center of our galaxy swallowing up stars at a very rapid rate. Mankind may one day meet this fate. On the other hand, scientists have suggested that very advanced technology could one day make use of the energy of black holes for mankind. These speculations sound like science fiction. But the theory of black holes in space is accepted by many serious scientists and astronomers. They show us a world which operates in a totally different way from our own and they question our most basic experience of space and time.
选项
答案
什么是黑洞呢?这个问题很难回答,因为我们把通常用来描述一种科学现象的术语用在这里来解释是不够的。天文学家和科学家们认为黑洞是个空间区域,物体会掉进去,而没有物体能从中逃逸出来——即使是光也不能,所以我们看不到黑洞。黑洞产生很强的引力,而它却没有物质。它只是空间——或者我们认为是空间。这是怎样发生的呢? 理论是一些星球的密度增长到某一特定点时就会爆炸。它们瓦解时会产生超新星。从地球上看去,超新星就像天空中非常耀眼的灯,即使在白天也能看到其闪光。黑洞最有说服力的证据来自对双星系的研究。双星,正如它们的名字所表明的,是两颗在空间位置上互相影响的星球。天文学家表示,在一些双星系里,有一颗看不到的伴星,即我们可以在天空中看到的一颗星球的伙伴。来自我们看到的星球的物质正被吸引到伴星去。这颗产生如此巨大力量的看不见的星球会是黑洞吗?天文学家还有其他一些星球的证据,这些星球可能与黑洞相伴。 对黑洞的研究刚刚开始,各种推测会层出不穷。在我们银河系的中心很可能存在着一个巨大的黑洞正以极快的速度吞噬着星球。人类有一天也会面临被吞噬的命运。而科学家也提出,有一天高科技会利用黑洞的能量为人类服务。这些设想听起来像科幻小说,但空间中黑洞的理论被许多严谨的科学家和天文学家接受。他们向我们展示了一个以完全不同于我们理解的方式运行的世界,并对我们掌握的最基本的时空经验提出了疑问。
解析
转载请注明原文地址:https://kaotiyun.com/show/UT8a777K
本试题收录于:
翻译硕士(英语翻译基础)题库专业硕士分类
0
翻译硕士(英语翻译基础)
专业硕士
相关试题推荐
异议登记的有效期是自异议登记之日起()
简述我国《民法典》规定的法人所有权制度。[中南财大2008年研改编]
在这个社交网站盛行的时代,按理说我们每人都应该有数百位朋友。但研究表明,我们中的大多数人事实上只有两个亲密的朋友,而25年前人均好友数量为三个。研究人员认为并不需要为此担心。他们指出,尽管我们当中有一部分人可能会变得“更脆弱”,但很多人只是更善于
救灾;赈灾
sharewealandwoewiththepeople
新能源示范城
《中庸》
Europeandebtcrisis
示范工程
sovereigndebtcrisis
随机试题
对于一个生产企业来说,物质文化层主要包括哪几个方面?
初孕妇,19岁。孕36周,无正规产前检查,孕32周时出现下肢水肿,近2天加重伴头晕。两次测量血压145~150/95~100mmHg,尿蛋白(+)~(++)。无宫缩,胎动正常。首先考虑的诊断是
我国银行机构的资本充足率不得低于()。
下列各项关于存货跌价准备相关会计处理的表述中,正确的是()。(2021年)
许多年前,清华园中有几位著名的人物,号称“清华三荪”,他们都是著名的单身汉。其中有个哲学家叫金龙荪的,也就是金岳霖。作者接下来最有可能主要介绍的是()。
以金融机构为媒介的信用是()。
某公司人才很多,但未能充分发挥作用,公司效益不高,大家都不满意。董事会新派来一位经理,据说非常能干。新经理到任后,认真阅看员工业务档案,逐一与员工长谈,甚至不辞辛苦地走访员工家庭,走访客户。可是,日子一天天过去,新经理却未见作为。于是员工私下议论:“他哪里
A、 B、 C、 D、 B题干每个图形的封闭区域数都是2,选项中只有B符合。
A.provideB.neverC.whetherD.explanationE.embarrassingF.neitherG.experiences
By"somepeople"Imeanme.Whyisitthataneveningstrollleavesmefeelingeatenalivewhilemycompanionsareleftblissful
最新回复
(
0
)