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
Astronomers believe that the expanding univers is the result of an enormous and powerful explosion catled the Big Bang. The Big
Astronomers believe that the expanding univers is the result of an enormous and powerful explosion catled the Big Bang. The Big
admin
2018-09-25
66
问题
Astronomers believe that the expanding univers is the result of an enormous and powerful explosion catled the Big Bang. The Big Bang theory may explain how the universe formed.
The Big Bang theory states that the universe began to expand with the explosion of concentrated matter and energy and has been expanding ever since. According to the theory, all the matter and energy in the universe was once concentrated into a single place. This place, of course, was extremely hot and dense. Then some 15 to 20 billion years ago, an explosion - the Big Bang - shot the concentrated matter and energy in all directions. The fastest moving matter traveled farthest away. Energy, too, began moving away from the area of the Big Bang.
If the Big Bang theory is correct, the energy left from the Big Bang will be eventy spread out throughout the universe. This energy is known as background radiation. And indeed, scientists have discovered that the background radiation is almost the same throughout the entire universe. The constant background radiation is one observation that supports the Big Bang theory. After the initial Big Bang, the force of gravity began to affect the matter racing outward in every direction. Gravity is a force of attraction between objects. All objects have a gravitational attraction. This force of gravity began to pull matter into clumps.
At some time, the clumps forned huge clusters of matter. These clumps became the galaxies of the universe. But even as the galaxies were forning, the matter inside the galaxies continued to race away from the area where the Big Bang had occurred. And this is just what astronomers have discovered. All of the galaxies are spending away from the center of the universe.
According to the passage, galaxies were formed because of______.
选项
A、the expansiion of the universe
B、the contraction of the universe
C、background radiation
D、the force of gravity
答案
D
解析
推理判断题,由文章第二段第三段可知,银河系的形成是因为重力。故答案选D。
转载请注明原文地址:https://kaotiyun.com/show/DX3O777K
0
成人本科学位英语
相关试题推荐
She______herhairstyleinherhometownbeforeshecametoChongqingforabetterjob.
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwithth
Therearewarmtropicalregionsallovertheglobe,butonlytheIndiansoftheSouthAmericanrainforestshaveformedthehabi
Notoncesincemysonwenttohighschool______travelingwithhim.
______,theprogramwentthroughwithoutanyproblemduringtheperformance.
Shortandshy,BenSaunderswasthelastkidinhisclasspickedforanysportsteam."Football,tennis,ricket—anythingwitha
Newspapersarenotnearlyaspopulartodayastheywereinthepast.Therearenotverymanypeoplewhoseriouslyreadanewspap
Manyplayerswhohadbeenhighlythoughtofhave______fromthetennisscene.
TheUnitedStates【C1】______alargepartoftheNorthAmericancontinent.ItsneighborsareCanada【C2】______thenorth,andMexico
Materialculturereferstothetouchable,material"things"—physicalobjectsthatcanbeseen,held,felt,used—thataculturepr
随机试题
公安机关在刑事诉讼中的基本职权有()。
下列不属于公司法调整范围的是()
根据《水工建筑物水泥灌浆施工技术规范》SL62—94,已完成灌浆或正在灌浆的地区,其附近()m以内不得进行爆破作业,否则应采取减震和防震措施。
1.背景:某市新建小区雨水管线工程,直径1500mm,长1320m,管顶覆土约4.8m,采用钢筋混凝土管,水泥砂浆抹带接口,90°混凝土基础;施工范围土质为硬塑的轻粉质黏土,无须降低地下水。由于场地狭小,无法采用机械开挖,项目部决定采用人工开挖:
简述教学设计要遵循整体性原则的原因。
(甲)宋儒理学的代表人物中,如陆九渊的读书经验也有可取之处。《陆象山语录》有一则写道:“如今读书且平平读,未晓处且放过,不必太滞。”接着,他又举出下面的一首诗:“读书切戒在慌忙,涵泳工夫兴味长;未晓不妨权放过,切身须要急思量。”这就是所谓“
(2006年真题)清朝制定的适用于少数民族聚居区的专门法律包括
下列行为可以判处死刑的有 ( )。
在VisualFoxPro中,创建数据库的命令是CREATEDATABASE<数据库文件名|?>,如果不指定数据库名称或使用问号,产生的结果是______.
Whenpeoplearestruckbylightening,theyfalltothegroundasthoughtheywerestruckbyasevereblowtothehead.Afterthe
最新回复
(
0
)