首页
登录
职称英语
Black Holes Trigger Stars to Self-Destru
Black Holes Trigger Stars to Self-Destru
资格题库
2022-08-02
59
问题
Black Holes Trigger Stars to Self-Destruct Scientists have long understood that supermassive black holes weighing millions or billions of suns can tear apart stars that come too close. The black hotels 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 in Meudon, France, carried out computer simulations of the final moments of such an unfortunate star's life,as it veered towards a supermassive black hole. When the star gets close enough, the uneven forces flatten it into a pancake 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 the star, it saves some of the star's matter from being devoured 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 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. Brassart agrees. "Perhaps it can be observed in the X-rays and gamma rays, but it's something that needs to be more studied," he says. Supernova researcher Chris Fryer of the Los Alamos National Laboratory in Los Alamos, New Mexico, US, says the deaths of these stars are difficult to simulate, and he is not sure whether the researchers have proven their case that they explode in the process.文章(36~40)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?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.
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
转载请注明原文地址:https://tihaiku.com/zcyy/1501473.html
本试题收录于:
综合A题库综合类分类
综合A
综合类
相关试题推荐
BlackHolesTriggerStarstoSelf-Destru
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
共用题干 EasternQuakescanTriggerBigSha
随机试题
面值100元债券,发行价格100元,票面利率年率4%,3年期,到期一次还本
对某产品进行价值分析,其产品功能与成本关系如下图所示,图中C1最有可能表示( )
某男性磨床操作工,工龄12年,体检时可见胸片不规则小阴影,调离原接尘岗位1年后复
背部手术后拆线时间是() A.4天 B.5-6天 C.7-9天 D.10
A.Brudzinski征 B.Babinski征 C.Romberg征
中年男性,锁骨上窝无痛性淋巴结肿大3个月,伴腹痛不适,低热盗汗等表现,发病来体重
影响施工质量的环境因素中,施工作业环境因素包括()A.地下障碍物的影响 B.施
质量管理体系的七项原则,包括以顾客为关注焦点、全员参与原则、关系管理,以及()。
分部分项工程量清单的项目编码由()位组成。 A.12B.11 C.
(2018年真题)关于缺陷责任期确定的说法,正确的是()。A.施工合同可以约定
最新回复
(
0
)