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
32
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
【S1】[br]【S9】B第三段的首句为这段的主题句,下文用Firstly,Secondly和Thirdly引出了学生从中学毕业后的选择。根据句法的分析,c
Twoyearsagothismonth,Doubledaypublishedahistoricalthrillerwithan
发现左侧舌缘溃疡一月余,迅速增大,进食困难,检查外形见图,颈部淋巴结肿大,最先考
A.高锰酸钾 B.阿托品 C.碳酸氢钠 D.氯解磷定 E.毛果芸香碱用于
关于沥青混凝土路面中封层作用的说法,正确的有()。A、封闭某一层,起保水、防水作
下列关于瘿痈的说法错误的是( )。A.发病前多无感冒、咽痛等病史 B.痛可牵
下列关于T3和T4代谢的叙述,哪一项是错误的A.20.%的T4与T3在肝内失活
下列情况,适合进行钢材期货卖出套期保值操作的有()。A.甲钢材经销商已按固定价
某项目釆用的基准收益率为12%,其基本方案的财务内部收益率为16.2%,现假设建
在借贷记账法下,负债类、所有者权益类的账户,期末是肯定有余额的。()
最新回复
(
0
)