首页
登录
职称英语
Astronomers believe that the expanding univers is the result of an enormous
Astronomers believe that the expanding univers is the result of an enormous
游客
2024-01-15
13
管理
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. [br] 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://tihaiku.com/zcyy/3364545.html
相关试题推荐
Amongthe15-year-oldchildren,some______bestudyinginuniversitywhileothers
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
GermanzoologistRandolfMenzelsaysbeesaren’tasbusyaspeoplebelievet
Auniversitygraduatedescribedasa"respectableandintelligent"womanis
随机试题
[originaltext]W:Doyouwantmetoexplainthesequestionsbeforetheexam?M:
[originaltext]M:Hi,Mary.Doyouwanttostartthelabreportafterwefinish
TwoCulturalDimensionsCultureisthecollectiveprogrammingofthemindwhich
A.变形链球菌 B.牙龈类杆菌与放线杆菌 C.溶血性链球菌 D.梭形杆菌和
A.活血行气止痛,消肿生肌 B.活血行气,调气止痛 C.活血祛瘀,利尿消肿
数学学科的结构、学科的教育价值和学科学习规律影响着制定数学( )。A.教育目标
下列哪一张图能反映2012年清洁能源机组并网容量中水电、核电和新能源发电的构
以50为平均数,以10为标准差来表示的标准分数为()。 (A)离差智商(B
甲承租乙的住房,租期未满,乙有意将该住房出售。根据合同法律制度的规定,下列表述中
某大型体育场项目竣工验收合格后15日内,建设单位应向有关部门提交的竣工验收备案文
最新回复
(
0
)