首页
登录
职称英语
[originaltext] Today most astronomers accept the notion that groups of stars
[originaltext] Today most astronomers accept the notion that groups of stars
游客
2023-08-28
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 since ancient times. And up to about the 17th century most of these scholars thought the size of the universe has 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 Issac Newton’s idea of gravity as a force of attraction, which contradicted the idea of a universe that is static, unchanging. If gravity causes all the stars out there in space to attract each other as Newton said, then they couldn’t remain motionless. Sooner or later all the stars will fall in towards each other. Well, scientists then propose a new model. Taking Newton’s theory into account, they didn’t want to abandon the idea of motionless status, but for this model to work, they had to modify Newton’s law of gravity, so they theorized that for distance as large as those between stars, the gravitation force repels rather than attracts. As you might guess, there are other contradictions. But this is pretty resolved by the currently accepted theory, which says the universe is continuously expanding. You’ll be reading all about that as your homework tonight.
26. What does the speaker say about most astronomers today?
27. What did most European scholars believe about the size of the universe before 17th century?
28. What did some scientists try to explain by suggesting that stars repel each other?
选项
A、Why stars are moving farther apart.
B、Why stars attract each other.
C、Why stars don’t fall in towards each other.
D、Why stars remain motionless.
答案
C
解析
短文提到,根据牛顿的万有引力法则,星球迟早会与其他星球聚集。一些科学家提出了一个新的模式,他们不愿摒弃宇宙不运动的想法,因而不得不修改牛顿的万有引力法则。他们认为星球之间相互排斥而不是吸引。这么一来,他们需要对这一理论进行解释了。C为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2964565.html
相关试题推荐
[originaltext]Duringthepastdecade,therehasbeenamultifoldincreasei
[originaltext]Duringthepastdecade,therehasbeenamultifoldincreasei
[originaltext]Exportersaregoingtohavetochangeiftheyhopetopenetr
[originaltext]Exportersaregoingtohavetochangeiftheyhopetopenetr
[originaltext]Exportersaregoingtohavetochangeiftheyhopetopenetr
[originaltext]Millionsofacresoflandwhereallkindsofwildlifemadeth
[originaltext]W:Hi,Ralf,howareyoudoing?M:Hi,Samantha,I’mfine,butI
[originaltext]W:Hi,Ralf,howareyoudoing?M:Hi,Samantha,I’mfine,butI
[originaltext]W:Morning.CanIhelpyou?M:Well.I’mnotreallysure.I’mjus
[originaltext]Feelingstressedlately?Hasthedoctorsaidhecannotfinda
随机试题
[originaltext]SeoulMetropolitanCityplanstosetupmorebicycle-onlyroa
(1)JebBush,whodubbedhimselfa"joyfultortoise"inhispursuitoftheR
Whatisonsalenow?[br][originaltext]W:Whereisthemusicvideosection?M:
在蛋白质中含量相对稳定的元素是A.碳(C) B.氢(H) C.氧(O) D
哪种全麻药与肾上腺素合用可导致严重心律失常A.氟烷 B.氧化亚氮 C.氯胺酮
基金作为一个营业主体,主要涉及的下列税收有()。A:营业税 B:印花税 C:
社会学习论的代表人物是()。 (A)华生(B)班杜拉 (C)勒温
下列各项中,属于企业留存收益的有()。A.按规定从净利润中提取的法定盈余公积
对于风险型CM模式来讲,最大工程费用GMP包括()。A.工程预算总成本
在图示电路中,电压U=( )。 A.0V B.4V C.6V D.
最新回复
(
0
)