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
It is just about impossible to imagine how big the universe is. All we can do is to describe certain things we know about it and
It is just about impossible to imagine how big the universe is. All we can do is to describe certain things we know about it and
admin
2019-04-07
53
问题
It is just about impossible to imagine how big the universe is. All we can do is to describe certain things we know about it and hope that these give an idea of the scale of the cosmos.
On clear nights, in places where light pollution from cities does not make it too difficult to see the stars, we can see many points of lights in the sky which are like a white cloud of stars. This is our home galaxy, the Milky Way. There are probably as many or more galaxies in the universe as there are stars in the Milky Way. Some estimates say there are 100 billion galaxies, each with millions of stars. Our home galaxy, like all others, is still forming stars all the time from gas floating in space.
Most galaxies contain not only stars, but also black holes. These are the tiny remains of stars that have collapsed in spectacular explosions. Gravity is so intense in black holes that light bends, so it can’t escape to be seen from outside. The mass of a black hole is so concentrated that the Earth would be reduced to the size of a tennis ball, while remaining as heavy as it is now.
Our nearest neighboring galaxy is Andromeda, which is two million light years away. A light year is the distance covered by light during one year, traveling at 300, 000 kilometers a second. The most distant galaxies that we can see, even with telescopes, are 10 to 12 billion light years a-way. That means it has taken the light from those galaxies that amount of time to reach the Earth. When that light left those galaxies, the universe was still quite young. The universe began with a gigantic explosion, called the Big Bang. About 14 to 15 billion years ago, something about the size of an atom suddenly started expanding dramatically. Out near the edge of the universe, there is still Cosmic Microwave Background, which is the heat left over from the Big Bang. Today the universe is still expanding in a process called inflation. And it may go on accelerating outwards from the original point for ever. The latest theories show that only a tiny proportion of the universe is made up of the kind of matter that we can see: about 15% of it is something called dark matter, and the rest, about 75% , is dark energy, which is driving the inflation of the universe.
How big is the universe?
选项
A、It has millions of stars.
B、It has 100 billion galaxies.
C、It is unimaginably big.
D、It has as many galaxies as the Milky Way.
答案
C
解析
文章第一句就提出宇宙大的人类根本无法想象,原句为It is just about impossible to imagine how big the universe is。故选C。
转载请注明原文地址:https://kaotiyun.com/show/RCjK777K
本试题收录于:
D类竞赛(专科)题库大学生英语竞赛(NECCS)分类
0
D类竞赛(专科)
大学生英语竞赛(NECCS)
相关试题推荐
SalesWhenastoresells【T1】_____________________atacostlowerthanusual,itiscalledasale.Saleslastfor【T2】____
SolarPowerThesunis【T1】______.It【T2】______.Peoplehavecreateddifferentwaysto【T3】______.Activesolarenergy【T4】
FastFoodMakesUsLessPatientFastfoodisamultibillion-dollarindustry.Forsomeofus,drive-throughdinnerhasbecome
A、Makingphonecallstotheirfriends.B、Sendingtextmessages.C、Thegraphtheywoulddesign.D、Losingpartoftheiridentity.
TipsforPlanningaPresentationI.TheculturalstyleofpresentationforEnglishspeakers-A【T1】________withonemaini
ComparingtheTOEFL,IELTS,andTOEICTestsThreepopularstandardizedtestsofEnglisha)TOEIC-tests【T1】________inin
Thelittleboyslippedoutoftheroomandheadedfortheswimmingpoolwithouthisparents’________.
(1)Corporatescandal,laborreductions,economicrecession.Thepastyearhasbeenasoberingexperiencefortheaverageworker,
VideogameshavebecomeincreasinglypopularinbotharcadesandtheaverageAmericanhome.Peopleofallagesandfromallwalk
A、672-555-3234B、627-355-3234C、627-555-2224D、627-555-3234D由原文可知,男士的电话号码是:627-555-3234。故答案为D。
随机试题
下列方剂中,组成药物含熟地黄的是()(2009年第155题)
与痰饮形成有关的脏腑是
合成氨工业中氨合成催化剂活化状态的活性成分是铁。()
A.挑选去毒B.搓洗去毒C.熏蒸去毒D.加碱去毒E.微生物去毒
()对锅炉内部压力极限值的控制及对锅炉的安全保护起着重要的作用。
内燃机有哪些固定件?
简述我国中学德育的基本任务与主要内容。
一个民族的生命基因,熔铸着文化的力量;一个民族前进的每一行足印,都闪耀着文化的光芒:一个民族的兴衰存亡,说到底是文化的兴衰存亡。当今世界各国,除了经济、科技、军事力量等“硬实力”的比拼,文化软实力的竞争也日趋激烈,因为文化愈来愈成为民族凝聚力和创造力的重要
A、About1/4.B、Below1/5.C、Over1/4.D、Over1/3.B
JusticeisoneofthemostpopularcoursesinHarvard’shistory.NearlyonethousandstudentscrowdHarvard’shistoricSandersT
最新回复
(
0
)