首页
登录
职称英语
[originaltext] Today most astronomers accept the notion that groups of stars t
[originaltext] Today most astronomers accept the notion that groups of stars t
游客
2024-01-21
55
管理
问题
Today most astronomers accept the notion that groups of stars that make up the universe are all moving farther and farther away from each other. But until very recently, this idea of an expanding universe was not a theory most European scholars believed in. (20) Since ancient times and up to about the 17th century, most of these scholars thought the size of the universe had remained unchanged since the moment of its creation or perhaps forever, with all the stars remaining more or less in place in relation to each other. But that was challenged in the late 17th century by Isaac Newton’s idea of gravity as a force of attraction, which contradicted the idea of a universe that is static, unchanging. (21) If gravity causes all the stars out there in space to attract each other as Newton said, then they could remain centrally motionless. Sooner or later all the stars will fall in towards each other. Well, scientists then proposed a new model, taking Newton’s theory into account. They didn’t want to abandon the idea of motionless stars, but for this model to work, so the stars wouldn’t fall in each other. They had to modify Newton’s law of gravity, so they theorized that for distance as large as those between stars, the gravitational force repels rather than attracts. As you might guess, this led to some other contradictions. But this was prettily resolved in the past centuries by the currently accepted theory, which says the universe is continuously expanding.
20. What theory challenged the idea about the size of the universe?
21. What will happen if it is gravity that causes all the stars in space to attract each other?
22. What is the speaker mainly talking about?
选项
A、Isaac Newton’s law of gravity.
B、The theory of induced gravity.
C、Le Sage’s theory of gravitation.
D、Three laws of motion.
答案
A
解析
短文指出,从古代到17世纪,大多数的学者认为从宇宙形成之日起,它的大小就从没有变化过,但是这种想法在17世纪晚期受到了牛顿重力学说的挑战。
转载请注明原文地址:https://tihaiku.com/zcyy/3381082.html
相关试题推荐
[originaltext]W:MayIcomein?M:Comein,please.Doyouknowwhattimeitis
[originaltext]W:Mike,doyouhaveaminute?M:Oh,hi,Cathy.Sure.What’sup?
[originaltext]W:Mike,doyouhaveaminute?M:Oh,hi,Cathy.Sure.What’sup?
[originaltext]W:Goodmorning,Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Goodmorning,Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Goodmorning,Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Goodmorning,Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Goodmorning,Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Goodmorning,Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]M:Excuseme,isthistheaddepartment?W:Sureis.CanIhelpy
随机试题
Inchoosingamethodfordeterminingclimaticconditionsthatexistedinthe
MostmenandmorethanhalfofthewomeninNorthAmericawork.Infact,man
Solarpowerhassomeobviousadvantagesoverotherenergysources.与其他能源相比,太阳能有一些
Morethanfivethousandyearsago,Chinesescholarsaccuratelydescribedtheflo
StatesExperimentwithOut-of-ClassroomLearning[A]AttheendofA
质量为20g的子弹以500m/s的速度射入一静止木块后,随木块一起以5
结合材料回答问题: 材料1 在庆祝新中国成立70周年前夕,中共中央总书记习近
中医药治疗出血证需辨证,或因瘀血引起,或因热所致,或因寒而生,临床应用时应明确辨
下列物质属氧化磷酸化解偶联剂的是A.氰化物 B.寡霉素 C.抗霉素A D.
某工程公司法定代表人授权其合约部经理李某签订某工程设计合同,该行为属于()。A.
最新回复
(
0
)