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
Black Holes Trigger Stars to Self-Destruct Scientists have long understood that supermassive(超大质量的)black holes weighing mill
Black Holes Trigger Stars to Self-Destruct Scientists have long understood that supermassive(超大质量的)black holes weighing mill
admin
2016-08-16
50
问题
Black Holes Trigger Stars to Self-Destruct
Scientists have long understood that supermassive(超大质量的)black holes weighing millions or billions of suns can tear apart stars that come too close. The black hole’ s gravity pulls harder on the nearest part of the star, an imbalance that pulls the star apart over a period of minutes or hours, once it gets close enough.
Scientists say this uneven pulling is not the only hazard facing the star. The strain of these unbalanced forces can also trigger a nuclear explosion powerful enough to destroy the star from within. Matthieu Brassart and Jean-Pierre Luminet of the Observatoire de Paris(巴黎天文台)in Meudon, France, carried out computer simulations of the final moments of such an unfortunate star’s life,as it veered(改变方向)towards a supermassive black hole.
When the star gets close enough, the uneven forces flatten it into a pancake(薄饼)shape. Some previous studies had suggested this flattening would increase the density and temperature inside the star enough to trigger intense nuclear reactions, that would tear it apart. But other studies had suggested that the picture would be complicated by shock waves generated during the flattening process and that no nuclear explosion should occur.
The new simulations investigated the effects of shock waves in detail, and found that even when their effects are included,the conditions favor a nuclear explosion. "There will be an explosion of the star—it will be completely destroyed," Brassart says. Although the explosion obliterates(使消失)the star, it saves some of the star’ s matter from being devoured(吞没)by the black hole. The explosion is powerful enough to hurl much of the star’ s matter out of the black hole’ s reach, he says.
The devouring of stars by black holes may already have been observed, although at a much later stage. It is thought that several months after the event that rips the star apart,its matter starts swirling(旋转)into the hole itself. It heats up as it does so, releasing ultraviolet light and X-rays.
If stars disrupted near black holes really do explode, then they could in principle allow these events to be detected at a much earlier stage, says Jules Hatpern of Columbia University in New York, US. " It may make it possible to see the disruption of that star immediately if it gets hot enough," he says.
Something destructive could happen to a star that gets too close to a black hole. Which of the following destructive statements is NOT mentioned in the passage?
选项
A、The black hole could tear apart the star.
B、The black hole could trigger a nuclear explosion in the star.
C、The black hole could dwindle its size considerably.
D、The black hole could devour the star.
答案
C
解析
通读全文可知,黑洞能够“tear apart stars that come too close”“trigger a nuclear explosionpowerful enough to destroy the star from within”“being devoured by the black hole”正对应A,B和D三项。第三段首句说the uneven forces flatten it into a pancake shape(扁形),而C项意为“黑洞可以大幅度地减小靠近星体的大小”,在文中没有提及,当选。
转载请注明原文地址:https://kaotiyun.com/show/mhGd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
ConsumerGoodsConsumerproductsaregoodsandservicesdestinedforthefinalconsumerforpersonal,family,orhouseholdus
CollegeSportsintheUSCollegesportsintheUnitedStatesareahugedeal.AlmostallmajorAmericanuniversitieshavef
CollegeSportsintheUSCollegesportsintheUnitedStatesareahugedeal.AlmostallmajorAmericanuniversitieshavef
HumanIngenuitySincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoolstocopewithworkthatisda
AttentiontotheDetails1.Attentiontodetailissomethingeveryonecanandshoulddo--especiallyinatightjobmarket.BobCr
Thetwogirlslookalike.
RenewableEnergySourcesTodaypetroleum(石油)providesaround40%oftheworld’senergyneeds,mostlyfuellingautomobiles.C
WeavingwithLightIntheSierraMadremountainrangeofwestcentralMexico,thenativeHuicholpeoplelivemuchthewayth
ElectronicTeachingThepotentialofclosed-circuittelevisionandothernewelectronicteachingtoolsissogreatthatiti
Youmustshineyourshoes.
随机试题
电子商务生产以()为中心。
A.上腹部包块B.肌紧张反跳痛C.胸腹腔积液D.腹壁皮下青紫E.假性肠梗阻急性胰腺炎常见的表现是
乳胶凝集试验属于
关于股票与债券的区别,下列说法错误的是( )。
依据《中华人民共和国教师法》的规定,下列属于教师义务的是()。
“考霸”宋涛是某中学高一(3)班的学生。同学们之所以称他为“考霸”,是因为他对成绩格外看重,每次考试后,他都会十分积极地去找老师问分数,大多数情况下他能取得令自己满意的成绩。事实上,宋涛上课时经常会在课堂上睡觉,他取得好成绩的秘密究竟在哪里?平时,宋涛总是
Tescohasoverhauleditspaypolicyfortopexecutivesasittriestoheadoffarepeatoflastyear’sembarrassingshareholder
森林里准备举行才艺比赛,比赛前的三个星期,兔子发现自己胖了,就打算减肥。比赛当天,熊猫顺利地打完了太极拳,小鸟唱出了好听的歌曲,最后是兔子的表演,大家都很期待,没想到它跳了不久就晕倒了。原来,兔子由于减肥过度,导致营养不良,需要住院治疗。本来兔子最有希望得
Inamovetodisseminatefacultyresearchandscholarshipmorebroadly,theFacultyofArtsandSciences(FAS)votedonTuesdayto
NewmodelpoliceWilliamBratton,thechiefoftheLosAngelesPoliceDepartment(LAPD),likestosaythat"copscount".They
最新回复
(
0
)